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The C Programming Language (sometimes termed K&R, after its authors' initials) is a computer programming book written by Brian Kernighan and Dennis Ritchie, the latter of whom originally designed and implemented the C programming language, as well as co-designed the Unix operating system with which development of the language was closely intertwined.
A snippet of C code which prints "Hello, World!". The syntax of the C programming language is the set of rules governing writing of software in C. It is designed to allow for programs that are extremely terse, have a close relationship with the resulting object code, and yet provide relatively high-level data abstraction.
This is an accepted version of this page This is the latest accepted revision, reviewed on 17 January 2025. General-purpose programming language "C programming language" redirects here. For the book, see The C Programming Language. Not to be confused with C++ or C#. C Logotype used on the cover of the first edition of The C Programming Language Paradigm Multi-paradigm: imperative (procedural ...
List of compilers supporting ANSI C: Acornsoft ANSI C (first version in 1988, revised in 1989) Amsterdam Compiler Kit (C K&R and C89/90) ARM RealView; Clang, using LLVM backend; GCC (full C89/90, C99 and C11) HP C/ANSI C compiler (C89 and C99) [32] IBM XL C/C++ (C11, starting with version 12.1) [33] Intel's ICC; LabWindows/CVI; LCC; Oracle ...
char * pc [10]; // array of 10 elements of 'pointer to char' char (* pa)[10]; // pointer to a 10-element array of char The element pc requires ten blocks of memory of the size of pointer to char (usually 40 or 80 bytes on common platforms), but element pa is only one pointer (size 4 or 8 bytes), and the data it refers to is an array of ten ...
The code in braces will always execute because the assignment expression a = 10 has the value 10 which is non-zero and therefore considered "true" in C; this is in part because C (and ALGOL) allow multiple assignment in the form a = b = c = 10; which is not supported by Pascal. Also note that a now has the value 10, which may affect the ...
The C programming language provides many standard library functions for file input and output.These functions make up the bulk of the C standard library header <stdio.h>. [1] The functionality descends from a "portable I/O package" written by Mike Lesk at Bell Labs in the early 1970s, [2] and officially became part of the Unix operating system in Version 7.