Tool and Tricks

The syntax of the C programming language is a set of rules that specifies whether the sequence of characters in a file is conforming C source code. The rules specify how the character sequences are to be chunked into tokens, the permissible sequences of these tokens and some of the meaning to be attributed to these permissible token sequences (additional meaning is assigned by the semantics of the language). C has a formal grammar specified by the C standard. Unlike languages such as FORTRAN 77, C source code is free-form which allows arbitrary use of whitespace to format code, rather than column-based or text-line-based restrictions. Comments may appear either between the delimiters /* and */, or (since C99) following // until the end of the line. C source files contain declarations and function definitions. Function definitions, in turn, contain declarations and statements. Declarations either define new types using keywords such as struct, union, and enum, or assign types to and ...

 In computing, C ( like the letter C) is a general-purpose programming language initially developed by Dennis Ritchie between 1969 and 1973 at Bell Labs. Its design provides constructs that map efficiently to typical machine instructions, and therefore it found lasting use in applications that had formerly been coded in assembly language, most notably system software like the Unix computer operating system. C is one of the most widely used programming languages of all time, and there are very few computer architectures for which a C compiler does not exist. Many later languages have borrowed directly or indirectly from C, including: C#, D, Go, Java, JavaScript, Limbo, LPC, Perl, PHP, Python, and Unix's C Shell. The most pervasive influence on these languages has been syntactical, and they tend to combine the recognizable expression and statement syntax of C with underlying type systems and data models that can be radically different. C++ started as a preprocessor for C and is...

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