text stringlengths 1 1k | source stringlengths 31 152 |
|---|---|
Computer programming or coding is the composition of sequences of instructions, called programs, that computers can follow to perform tasks. It involves designing and implementing algorithms, step-by-step specifications of procedures, by writing code in one or more programming languages. Programmers typically use high-... | https://en.wikipedia.org/wiki/Computer_programming |
le these are sometimes considered programming, often the term software development is used for this larger overall process – with the terms programming, implementation, and coding reserved for the writing and editing of code per se. Sometimes software development is known as software engineering, especially when it emp... | https://en.wikipedia.org/wiki/Computer_programming |
rds with holes punched in them.
Code-breaking algorithms have also existed for centuries. In the 9th century, the Arab mathematician Al-Kindi described a cryptographic algorithm for deciphering encrypted code, in A Manuscript on Deciphering Cryptographic Messages. He gave the first description of cryptanalysis by frequ... | https://en.wikipedia.org/wiki/Computer_programming |
the analytical engine beyond mathematical calculations.
In the 1880s, Herman Hollerith invented the concept of storing data in machine-readable form. Later a control panel (plug board) added to his 1906 Type I Tabulator allowed it to be programmed for different jobs, and by the late 1940s, unit record equipment such ... | https://en.wikipedia.org/wiki/Computer_programming |
for specifying addresses. However, because an assembly language is little more than a different notation for a machine language, two machines with different instruction sets also have different assembly languages.
=== Compiler languages ===
High-level languages made the process of developing a program simpler and ... | https://en.wikipedia.org/wiki/Computer_programming |
sets via compilation declarations and heuristics. Compilers harnessed the power of computers to make programming easier by allowing programmers to specify calculations by entering a formula using infix notation.
=== Source code entry ===
Programs were mostly entered using punched cards or paper tape. By the late 196... | https://en.wikipedia.org/wiki/Computer_programming |
ng mistakes, such as mistakes in resource management (e.g., buffer overflows and race conditions) and logic errors (such as division by zero or off-by-one errors).
Robustness: how well a program anticipates problems due to errors (not bugs). This includes situations such as incorrect, inappropriate or corrupt data, una... | https://en.wikipedia.org/wiki/Computer_programming |
tforms on which the source code of a program can be compiled/interpreted and run. This depends on differences in the programming facilities provided by the different platforms, including hardware and operating system resources, expected behavior of the hardware and operating system, and availability of platform-specifi... | https://en.wikipedia.org/wiki/Computer_programming |
bandwidth and to some extent even user interaction): the less, the better. This also includes careful management of resources, for example cleaning up temporary files and eliminating memory leaks. This is often discussed under the shadow of a chosen programming language. Although the language certainly affects perform... | https://en.wikipedia.org/wiki/Computer_programming |
ity above, including portability, usability and most importantly maintainability.
Readability is important because programmers spend the majority of their time reading, trying to understand, reusing, and modifying existing source code, rather than writing new source code. Unreadable code often leads to bugs, inefficien... | https://en.wikipedia.org/wiki/Computer_programming |
pects of this (such as indents, line breaks, color highlighting, and so on) are often handled by the source code editor, but the content aspects reflect the programmer's talent and skills.
Various visual programming languages have also been developed with the intent to resolve readability concerns by adopting non-tradi... | https://en.wikipedia.org/wiki/Computer_programming |
f well-established algorithms and their respective complexities and use this knowledge to choose algorithms that are best suited to the circumstances.
=== Methodologies ===
The first step in most formal software development processes is requirements analysis, followed by testing to determine value modeling, implement... | https://en.wikipedia.org/wiki/Computer_programming |
AD and MDA.
A similar technique used for database design is Entity-Relationship Modeling (ER Modeling).
Implementation techniques include imperative languages (object-oriented or procedural), functional languages, and logic programming languages.
=== Measuring language usage ===
It is very difficult to determine what... | https://en.wikipedia.org/wiki/Computer_programming |
is still strong in corporate data centers often on large mainframe computers, Fortran in engineering applications, scripting languages in Web development, and C in embedded software. Many applications use a mix of several languages in their construction and use. New languages are generally designed around the syntax ... | https://en.wikipedia.org/wiki/Computer_programming |
lems. Normally the first step in debugging is to attempt to reproduce the problem. This can be a non-trivial task, for example as with parallel processes or some unusual software bugs. Also, specific user environment and usage history can make it difficult to reproduce the problem.
After the bug is reproduced, the inpu... | https://en.wikipedia.org/wiki/Computer_programming |
ufficient for bugs to appear. Scripting and breakpointing are also part of this process.
Debugging is often done with IDEs. Standalone debuggers like GDB are also used, and these often provide less of a visual environment, usually using a command line. Some text editors such as Emacs allow GDB to be invoked through the... | https://en.wikipedia.org/wiki/Computer_programming |
given language execute. Languages form an approximate spectrum from "low-level" to "high-level"; "low-level" languages are typically more machine-oriented and faster to execute, whereas "high-level" languages are more abstract and easier to use but execute less quickly. It is usually easier to code in "high-level" lang... | https://en.wikipedia.org/wiki/Computer_programming |
onal Execution: Check for certain conditions and execute the appropriate sequence of statements.
Repetition: Perform some action repeatedly, usually with some variation.
Many computer languages provide a mechanism to call functions provided by shared libraries. Provided the functions in a library follow the appropriate... | https://en.wikipedia.org/wiki/Computer_programming |
movement and make institutionalize change. Through these social ideals and educational agendas, learning to code has become important not just for scientists and engineers, but for millions of citizens who have come to believe that creating software is beneficial to society and its members.
=== Context ===
In 1957, t... | https://en.wikipedia.org/wiki/Computer_programming |
fic instructions about how to program a computer may have been Maurice Wilkes, David Wheeler, and Stanley Gill's Preparation of Programs for an Electronic Digital Computer (1951). The book offered a selection of common subroutines for handling basic operations on the EDSAC, one of the world's first stored-program compu... | https://en.wikipedia.org/wiki/Computer_programming |
AN to a larger audience, including students and office workers.
In 1961, Alan Perlis suggested that all university freshmen at Carnegie Technical Institute take a course in computer programming. His advice was published in the popular technical journal Computers and Automation, which became a regular source of informat... | https://en.wikipedia.org/wiki/Computer_programming |
gram a developer could create in a given system. Programmer's guides then went on to discuss core topics like declaring variables, data types, formulas, flow control, user-defined functions, manipulating data, and other topics.
Early and influential programmer's guides included John G. Kemeny and Thomas E. Kurtz's BASI... | https://en.wikipedia.org/wiki/Computer_programming |
d disciplines. Donald Knuth's The Art of Computer Programming (1968 and later), presented hundreds of computational algorithms and their analysis. The Elements of Programming Style (1974), by Brian W. Kernighan and P. J. Plauger, concerned itself with programming style, the idea that programs should be written not only... | https://en.wikipedia.org/wiki/Computer_programming |
ncludes BASIC Computer Games, Microcomputer Edition (1978), by David Ahl; Programming the Z80 (1979), by Rodnay Zaks; Programmer's CP/M Handbook (1983), by Andy Johnson-Laird; C Primer Plus (1984), by Mitchell Waite and The Waite Group; The Peter Norton Programmer's Guide to the IBM PC (1985), by Peter Norton; Advanced... | https://en.wikipedia.org/wiki/Computer_programming |
ite Group Press, Wiley, Wrox Press, and Ziff-Davis.
Computer magazines and journals also provided learning content for professional and hobbyist programmers. A partial list of these resources includes Amiga World, Byte (magazine), Communications of the ACM, Computer (magazine), Compute!, Computer Language (magazine), C... | https://en.wikipedia.org/wiki/Computer_programming |
et resources for learning to code included blogs, wikis, videos, online databases, subscription sites, and custom websites focused on coding skills. New commercial resources included YouTube videos, Lynda.com tutorials (later LinkedIn Learning), Khan Academy, Codecademy, GitHub, W3Schools, and numerous coding bootcamps... | https://en.wikipedia.org/wiki/Computer_programming |
programmers, including resources like the Microsoft Developer Network (MSDN). Contemporary movements like Hour of Code (Code.org) show how learning to program has become associated with digital learning strategies, education agendas, and corporate philanthropy.
== Programmers ==
Computer programmers are those who w... | https://en.wikipedia.org/wiki/Computer_programming |
of the Women Who Made the Internet. New York: Portfolio/Penguin. ISBN 9780735211759.
Gürer, Denise (1995). "Pioneering Women in Computer Science" (PDF). Communications of the ACM. 38 (1): 45–54. doi:10.1145/204865.204875. S2CID 6626310. Archived (PDF) from the original on October 9, 2022.
Smith, Erika E. (2013). "Reco... | https://en.wikipedia.org/wiki/Computer_programming |
erald M., The Psychology of Computer Programming, New York: Van Nostrand Reinhold (1971)
Edsger W. Dijkstra, A Discipline of Programming, Prentice-Hall (1976)
O.-J. Dahl, E.W.Dijkstra, C.A.R. Hoare, Structured Programming, Academic Press (1972)
David Gries, The Science of Programming, Springer-Verlag (1981)
== Extern... | https://en.wikipedia.org/wiki/Computer_programming |
A programming language is a system of notation for writing computer programs.
Programming languages are described in terms of their syntax (form) and semantics (meaning), usually defined by a formal language. Languages usually provide features such as a type system, variables, and mechanisms for error handling. An impl... | https://en.wikipedia.org/wiki/Programming_language |
y.
Thousands of programming languages—often classified as imperative, functional, logic, or object-oriented—have been developed for a wide variety of uses. Many aspects of programming language design involve tradeoffs—for example, exception handling simplifies error handling, but at a performance cost. Programming lang... | https://en.wikipedia.org/wiki/Programming_language |
larly, the term "computer language" may be used in contrast to the term "programming language" to describe languages used in computing but not considered programming languages. Most practical programming languages are Turing complete, and as such are equivalent in what programs they can compute.
Another usage regards p... | https://en.wikipedia.org/wiki/Programming_language |
ats.
== History ==
=== Early developments ===
The first programmable computers were invented at the end of the 1940s, and with them, the first programming languages. The earliest computers were programmed in first-generation programming languages (1GLs), machine language (simple instructions that could be directly ... | https://en.wikipedia.org/wiki/Programming_language |
gh-level programming languages (third-generation programming languages—3GLs)—revolutionized programming. These languages abstracted away the details of the hardware, instead being designed to express algorithms that could be understood more easily by humans. For example, arithmetic expressions could now be written in s... | https://en.wikipedia.org/wiki/Programming_language |
ned for minimal interaction. After the invention of the microprocessor, computers in the 1970s became dramatically cheaper. New computers also allowed more user interaction, which was supported by newer programming languages.
Lisp, implemented in 1958, was the first functional programming language. Unlike Fortran, it s... | https://en.wikipedia.org/wiki/Programming_language |
ng its innovations adopted by later programming languages included greater portability and the first use of context-free, BNF grammar. Simula, the first language to support object-oriented programming (including subtypes, dynamic dispatch, and inheritance), also descends from ALGOL and achieved commercial success. C, a... | https://en.wikipedia.org/wiki/Programming_language |
e personal computer transformed the roles for which programming languages were used. New languages introduced in the 1980s included C++, a superset of C that can compile C programs but also supports classes and inheritance. Ada and other new languages introduced support for concurrency. The Japanese government invested... | https://en.wikipedia.org/wiki/Programming_language |
pt, PHP, and Ruby—designed to quickly produce small programs that coordinate existing applications. Due to their integration with HTML, they have also been used for building web pages hosted on servers.
=== 2000s to present ===
During the 2000s, there was a slowdown in the development of new programming languages tha... | https://en.wikipedia.org/wiki/Programming_language |
Some of the new programming languages are classified as visual programming languages like Scratch, LabVIEW and PWCT. Also, some of these languages mix between textual and visual programming usage like Ballerina. Also, this trend lead to developing projects that help in developing new VPLs like Blockly by Google. Many g... | https://en.wikipedia.org/wiki/Programming_language |
nguages. On the other hand, some programming languages are graphical, using visual relationships between symbols to specify a program.
The syntax of a language describes the possible combinations of symbols that form a syntactically correct program. The meaning given to a combination of symbols is handled by semantics ... | https://en.wikipedia.org/wiki/Programming_language |
lphabetical characters (excluding whitespace); and
a list is a matched pair of parentheses, with zero or more expressions inside it.
The following are examples of well-formed token sequences in this grammar: 12345, () and (a b c232 (1)).
Not all syntactically correct programs are semantically correct. Many syntacticall... | https://en.wikipedia.org/wiki/Programming_language |
no generally accepted meaning.
"John is a married bachelor." is grammatically well-formed but expresses a meaning that cannot be true.
The following C language fragment is syntactically correct, but performs operations that are not semantically defined (the operation *p >> 4 has no meaning for a value having a complex ... | https://en.wikipedia.org/wiki/Programming_language |
allow execution during the parsing phase. Languages that have constructs that allow the programmer to alter the behavior of the parser make syntax analysis an undecidable problem, and generally blur the distinction between parsing and execution. In contrast to Lisp's macro system and Perl's BEGIN blocks, which may cont... | https://en.wikipedia.org/wiki/Programming_language |
that the labels on the arms of a case statement are distinct. Many important restrictions of this type, like checking that identifiers are used in the appropriate context (e.g. not adding an integer to a function name), or that subroutine calls have the appropriate number and type of arguments, can be enforced by defin... | https://en.wikipedia.org/wiki/Programming_language |
as execution semantics) of a language defines how and when the various constructs of a language should produce a program behavior. There are many ways of defining execution semantics. Natural language is often used to specify the execution semantics of languages commonly used in practice. A significant amount of acade... | https://en.wikipedia.org/wiki/Programming_language |
on of every operation defines types of data to which the operation is applicable. In contrast, an untyped language, such as most assembly languages, allows any operation to be performed on any data, generally sequences of bits of various lengths. In practice, while few languages are fully typed, most offer a degree of ... | https://en.wikipedia.org/wiki/Programming_language |
wer type errors can be detected.
==== Commonly supported types ====
Early programming languages often supported only built-in, numeric types such as the integer (signed and unsigned) and floating point (to support operations on real numbers that are not integers). Most programming languages support multiple sizes ... | https://en.wikipedia.org/wiki/Programming_language |
erences to data stored elsewhere and support elements of varying types. Depending on the programming language, sequences of multiple characters, called strings, may be supported as arrays of characters or their own primitive type. Strings may be of fixed or variable length, which enables greater flexibility at the cost... | https://en.wikipedia.org/wiki/Programming_language |
esentation of the data and operations are hidden from the user, who can only access an interface. The benefits of data abstraction can include increased reliability, reduced complexity, less potential for name collision, and allowing the underlying data structure to be changed without the client needing to alter its co... | https://en.wikipedia.org/wiki/Programming_language |
ble but only the value encoded in it. A single variable can be reused for a value of a different type. Although this provides more flexibility to the programmer, it is at the cost of lower reliability and less ability for the programming language to check for errors. Some languages allow variables of a union type to wh... | https://en.wikipedia.org/wiki/Programming_language |
essors. Other programming languages do support managing data shared between different threads by controlling the order of execution of key instructions via the use of semaphores, controlling access to shared data via monitor, or enabling message passing between threads.
=== Exception handling ===
Many programming la... | https://en.wikipedia.org/wiki/Programming_language |
tradeoff between increased ability to handle exceptions and reduced performance. For example, even though array index errors are common C does not check them for performance reasons. Although programmers can write code to catch user-defined exceptions, this can clutter a program. Standard libraries in some languages, s... | https://en.wikipedia.org/wiki/Programming_language |
be piped back and forth to the CPU. The central elements in these languages are variables, assignment, and iteration, which is more efficient than recursion on these machines.
Many programming languages have been designed from scratch, altered to meet new needs, and combined with other languages. Many have eventually... | https://en.wikipedia.org/wiki/Programming_language |
rams in the language, the cost of compiling the code, and increase runtime performance.
Although early programming languages often prioritized efficiency over readability, the latter has grown in importance since the 1970s. Having multiple operations to achieve the same result can be detrimental to readability, as is... | https://en.wikipedia.org/wiki/Programming_language |
ogramming languages were tied very closely to the underlying hardware of the computer, but over time support for abstraction has increased, allowing programmers express ideas that are more remote from simple translation into underlying hardware instructions. Because programmers are less tied to the complexity of the co... | https://en.wikipedia.org/wiki/Programming_language |
g code easier but comes at the cost of readability.
Natural-language programming has been proposed as a way to eliminate the need for a specialized language for programming. However, this goal remains distant and its benefits are open to debate. Edsger W. Dijkstra took the position that the use of a formal language is... | https://en.wikipedia.org/wiki/Programming_language |
nitions may be written in natural language (e.g., as in the C language), or a formal semantics (e.g., as in Standard ML and Scheme specifications).
A description of the behavior of a translator for the language (e.g., the C++ and Fortran specifications). The syntax and semantics of the language have to be inferred from... | https://en.wikipedia.org/wiki/Programming_language |
de via an intermediate-level language into machine code, known as an executable. Once the program is compiled, it will run more quickly than with other implementation methods. Some compilers are able to provide further optimization to reduce memory or computation usage when the executable runs, but increasing compilati... | https://en.wikipedia.org/wiki/Programming_language |
== Proprietary languages ==
Although most of the most commonly used programming languages have fully open specifications and implementations, many programming languages exist only as proprietary programming languages with the implementation available only from a single vendor, which may claim that such a proprietary la... | https://en.wikipedia.org/wiki/Programming_language |
.
Many proprietary languages are widely used, in spite of their proprietary nature; examples include MATLAB, VBScript, and Wolfram Language. Some languages may make the transition from closed to open; for example, Erlang was originally Ericsson's internal programming language.
Open source programming languages are part... | https://en.wikipedia.org/wiki/Programming_language |
speaking, computers "do exactly what they are told to do", and cannot "understand" what code the programmer intended to write. The combination of the language definition, a program, and the program's inputs must fully specify the external behavior that occurs when the program is executed, within the domain of control ... | https://en.wikipedia.org/wiki/Programming_language |
ramming is the process by which programmers combine these primitives to compose new programs, or adapt existing ones to new uses or a changing environment.
Programs for a computer might be executed in a batch process without any human interaction, or a user might type commands in an interactive session of an interprete... | https://en.wikipedia.org/wiki/Programming_language |
ions. For example, COBOL is still strong in the corporate data center, often on large mainframes; Fortran in scientific and engineering applications; Ada in aerospace, transportation, military, real-time, and embedded applications; and C in embedded applications and operating systems. Other languages are regularly used... | https://en.wikipedia.org/wiki/Programming_language |
orted the ten most popular programming languages (in descending order by overall popularity): Java, C, C++, Python, C#, JavaScript, VB .NET, R, PHP, and MATLAB.
As of June 2024, the top five programming languages as measured by TIOBE index are Python, C++, C, Java and C#. TIOBE provides a list of top 100 programming la... | https://en.wikipedia.org/wiki/Programming_language |
n syntax and Lisp-like semantics are considered Lisp dialects, although they vary wildly as do, say, Racket and Clojure. As it is common for one language to have several dialects, it can become quite difficult for an inexperienced programmer to find the right documentation. The BASIC language has many dialects.
== Cl... | https://en.wikipedia.org/wiki/Programming_language |
for their simplicity and elegance, problems with efficiency have prevented them from being widely adopted.
Logic languages are designed so that the software, rather than the programmer, decides what order in which the instructions are executed.
Object-oriented programming—whose characteristic features are data abstract... | https://en.wikipedia.org/wiki/Programming_language |
C (pronounced – like the letter c) is a general-purpose programming language. It was created in the 1970s by Dennis Ritchie and remains very widely used and influential. By design, C's features cleanly reflect the capabilities of the targeted CPUs. It has found lasting use in operating systems code (especially in kern... | https://en.wikipedia.org/wiki/C_(programming_language) |
all modern computer architectures and operating systems. The book The C Programming Language, co-authored by the original language designer, served for many years as the de facto standard for the language. C has been standardized since 1989 by the American National Standards Institute (ANSI) and, subsequently, jointly... | https://en.wikipedia.org/wiki/C_(programming_language) |
iety of computer platforms and operating systems with few changes to its source code.
Since 2000, C has consistently ranked among the top four languages in the TIOBE index, a measure of the popularity of programming languages.
== Overview ==
C is an imperative, procedural language in the ALGOL tradition. It has a s... | https://en.wikipedia.org/wiki/C_(programming_language) |
, including a full set of control flow primitives: if/else, for, do/while, while, and switch. User-defined names are not distinguished from keywords by any kind of sigil.
It has a large number of arithmetic, bitwise, and logic operators: +,+=,++,&,||, etc.
More than one assignment may be performed in a single statement... | https://en.wikipedia.org/wiki/C_(programming_language) |
ompared using a single built-in operator (the elements must be compared individually).
Union is a structure with overlapping members; it allows multiple data types to share the same memory location.
Array indexing is a secondary notation, defined in terms of pointer arithmetic. Whole arrays cannot be assigned or compar... | https://en.wikipedia.org/wiki/C_(programming_language) |
library routines.
A preprocessor performs macro definition, source code file inclusion, and conditional compilation.
There is a basic form of modularity: files can be compiled separately and linked together, with control over which functions and data objects are visible to other files via static and extern attributes.... | https://en.wikipedia.org/wiki/C_(programming_language) |
y later languages have borrowed directly or indirectly from C, including C++, C#, Unix's C shell, D, Go, Java, JavaScript (including transpilers), Julia, Limbo, LPC, Objective-C, Perl, PHP, Python, Ruby, Rust, Swift, Verilog and SystemVerilog (hardware description languages). These languages have drawn many of their c... | https://en.wikipedia.org/wiki/C_(programming_language) |
on of Unix was also developed in assembly language.
==== B ====
Thompson wanted a programming language for developing utilities for the new platform. He first tried writing a Fortran compiler, but he soon gave up the idea and instead created a cut-down version of the recently developed systems programming language c... | https://en.wikipedia.org/wiki/C_(programming_language) |
cant addition was a character data type. He called this New B (NB). Thompson started to use NB to write the Unix kernel, and his requirements shaped the direction of the language development. Through to 1972, richer types were added to the NB language: NB had arrays of int and char. Pointers, the ability to generate... | https://en.wikipedia.org/wiki/C_(programming_language) |
nyder and also in recognition of the usefulness of the file-inclusion mechanisms available in BCPL and PL/I. Its original version provided only included files and simple string replacements: #include and #define of parameterless macros. Soon after that, it was extended, mostly by Mike Lesk and then by John Reiser, to i... | https://en.wikipedia.org/wiki/C_(programming_language) |
published the first edition of The C Programming Language. Known as K&R from the initials of its authors, the book served for many years as an informal specification of the language. The version of C that it describes is commonly referred to as "K&R C". As this was released in 1978, it is now also referred to as C78. ... | https://en.wikipedia.org/wiki/C_(programming_language) |
ricted themselves when maximum portability was desired, since many older compilers were still in use, and because carefully written K&R C code can be legal Standard C as well.
In early versions of C, only functions that return types other than int must be declared if used before the function definition; functions used ... | https://en.wikipedia.org/wiki/C_(programming_language) |
check for consistency of function use across multiple source files.
In the years following the publication of K&R C, several features were added to the language, supported by compilers from AT&T (in particular PCC) and some other vendors. These included:
void functions (i.e., functions with no return value)
functions... | https://en.wikipedia.org/wiki/C_(programming_language) |
minicomputers, and microcomputers, including the IBM PC, as its popularity began to increase significantly.
In 1983 the American National Standards Institute (ANSI) formed a committee, X3J11, to establish a standard specification of C. X3J11 based the C standard on the Unix implementation; however, the non-portable po... | https://en.wikipedia.org/wiki/C_(programming_language) |
d independently, but defers to the international C standard, maintained by the working group ISO/IEC JTC1/SC22/WG14. National adoption of an update to the international standard typically occurs within a year of ISO publication.
One of the aims of the C standardization process was to produce a superset of K&R C, incor... | https://en.wikipedia.org/wiki/C_(programming_language) |
s will run correctly on any platform with a conforming C implementation, within its resource limits. Without such precautions, programs may compile only on a certain platform or with a particular compiler, due, for example, to the use of non-standard libraries, such as GUI libraries, or to a reliance on compiler- or p... | https://en.wikipedia.org/wiki/C_(programming_language) |
nsive support for international character sets.
=== C99 ===
The C standard was further revised in the late 1990s, leading to the publication of ISO/IEC 9899:1999 in 1999, which is commonly referred to as "C99". It has since been amended three times by Technical Corrigenda.
C99 introduced several new features, includ... | https://en.wikipedia.org/wiki/C_(programming_language) |
VERSION__ is defined with value 199901L to indicate that C99 support is available. GCC, Solaris Studio, and other C compilers now support many or all of the new features of C99. The C compiler in Microsoft Visual C++, however, implements the C89 standard and those parts of C99 that are required for compatibility with C... | https://en.wikipedia.org/wiki/C_(programming_language) |
e support, atomic operations, multi-threading, and bounds-checked functions. It also makes some portions of the existing C99 library optional, and improves compatibility with C++. The standard macro __STDC_VERSION__ is defined as 201112L to indicate that C11 support is available.
=== C17 ===
C17 is an informal name... | https://en.wikipedia.org/wiki/C_(programming_language) |
is an informal name for the next major C language standard revision, after C23 (C2X), that is hoped to be released later in the 2020s, hence the '2' in "C2Y". An early working draft of C2Y was released in February 2024 as N3220 by the working group ISO/IEC JTC1/SC22/WG14.
=== Embedded C ===
Historically, embedded C ... | https://en.wikipedia.org/wiki/C_(programming_language) |
wever, line boundaries do have significance during the preprocessing phase. Comments may appear either between the delimiters /* and */, or (since C99) following // until the end of the line. Comments delimited by /* and */ do not nest, and these sequences of characters are not interpreted as comment delimiters if they... | https://en.wikipedia.org/wiki/C_(programming_language) |
ve language, C uses statements to specify actions. The most common statement is an expression statement, consisting of an expression to be evaluated, followed by a semicolon; as a side effect of the evaluation, functions may be called and variables assigned new values. To modify the normal sequential execution of state... | https://en.wikipedia.org/wiki/C_(programming_language) |
switch selects a case to be executed based on the value of an integer expression. Different from many other languages, control-flow will fall through to the next case unless terminated by a break.
Expressions can use a variety of built-in operators and may contain function calls. The order in which arguments to functio... | https://en.wikipedia.org/wiki/C_(programming_language) |
g languages.
Kernighan and Ritchie say in the Introduction of The C Programming Language: "C, like any other language, has its blemishes. Some of the operators have the wrong precedence; some parts of the syntax could be better." The C standard did not attempt to correct many of these blemishes, because of the impact o... | https://en.wikipedia.org/wiki/C_(programming_language) |
not entirely portable. Since C99 multi-national Unicode characters can be embedded portably within C source text by using \uXXXX or \UXXXXXXXX encoding (where X denotes a hexadecimal character).
The basic C execution character set contains the same characters, along with representations for alert, backspace, and carri... | https://en.wikipedia.org/wiki/C_(programming_language) |
capital letter, because identifiers of that form were previously reserved by the C standard for use only by implementations. Since existing program source code should not have been using these identifiers, it would not be affected when C implementations started supporting these extensions to the programming language.... | https://en.wikipedia.org/wiki/C_(programming_language) |
specify the manipulations to be performed while evaluating that expression. C has operators for:
arithmetic: +, -, *, /, %
assignment: =
augmented assignment: +=, -=, *=, /=, %=, &=, |=, ^=, <<=, >>=
bitwise logic: ~, &, |, ^
bitwise shifts: <<, >>
Boolean logic: !, &&, ||
conditional evaluation: ? :
equality testing... | https://en.wikipedia.org/wiki/C_(programming_language) |
in many cases the mistake does not produce an error message (although some compilers produce warnings). For example, the conditional expression if (a == b + 1) might mistakenly be written as if (a = b + 1), which will be evaluated as true unless the value of a is 0 after the assignment.
The C operator precedence is no... | https://en.wikipedia.org/wiki/C_(programming_language) |
the program contains a preprocessing directive, indicated by #include. This causes the compiler to replace that line of code with the entire text of the stdio.h header file, which contains declarations for standard input and output functions such as printf and scanf. The angle brackets surrounding stdio.h indicate that... | https://en.wikipedia.org/wiki/C_(programming_language) |
as a parameter list indicates that the main function takes no arguments.
The opening curly brace indicates the beginning of the code that defines the main function.
The next line of the program is a statement that calls (i.e. diverts execution to) a function named printf, which in this case is supplied from a system l... | https://en.wikipedia.org/wiki/C_(programming_language) |
the printf function is of type int, but it is silently discarded since it is not used. (A more careful program might test the return value to check that the printf function succeeded.) The semicolon ; terminates the statement.
The closing curly brace indicates the end of the code for the main function. According to th... | https://en.wikipedia.org/wiki/C_(programming_language) |
s. C99 added a Boolean data type. There are also derived types including arrays, pointers, records (struct), and unions (union).
C is often used in low-level systems programming where escapes from the type system may be necessary. The compiler attempts to ensure type correctness of most expressions, but the programm... | https://en.wikipedia.org/wiki/C_(programming_language) |
sion of the signed value to unsigned. This can generate unexpected results if the signed value is negative.
=== Pointers ===
C supports the use of pointers, a type of reference that records the address or location of an object or function in memory. Pointers can be dereferenced to access data stored at the address ... | https://en.wikipedia.org/wiki/C_(programming_language) |
formed using pointers; the result of a malloc is usually cast to the data type of the data to be stored. Many data types, such as trees, are commonly implemented as dynamically allocated struct objects linked together using pointers. Pointers to other pointers are often used in multi-dimensional arrays and arrays of s... | https://en.wikipedia.org/wiki/C_(programming_language) |
End of preview. Expand in Data Studio
README.md exists but content is empty.
- Downloads last month
- 3