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Top Forums Programming C++ : is what the meaning of #include<stdio.h>? Post 302765997 by neutronscott on Monday 4th of February 2013 03:41:06 AM
Old 02-04-2013
Early in the compiling of a source, a preprocessor takes these # directives. #include basically puts all of stdio.h into the top of your code. the .h identifies it as a "header".

In C, before you use a function, the compiler must first know how it is suppose to be called.

For example, how many arguments and of what type? All this is in stdio.h, for the Standard I/O functions (things that print to the screen and such).

Usually, in C++ it's #include <iostream>, but we won't fault you for using C functions Smilie
 

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FPUTS(3)						   BSD Library Functions Manual 						  FPUTS(3)

NAME
fputs, puts -- output a line to a stream LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdio.h> int fputs(const char *restrict s, FILE *restrict stream); int puts(const char *s); DESCRIPTION
The function fputs() writes the string pointed to by s to the stream pointed to by stream. The function puts() writes the string s, and a terminating newline character, to the stream stdout. RETURN VALUES
The functions fputs() and puts() return a nonnegative integer on success and EOF on error. ERRORS
[EBADF] The stream argument is not a writable stream. The functions fputs() and puts() may also fail and set errno for any of the errors specified for the routines write(2). COMPATIBILITY
fputs() now returns a non-negative number (as opposed to 0) on successful completion. As a result, many tests (e.g., "fputs() == 0", "fputs() != 0") do not give the desired result. Use "fputs() != EOF" or "fputs() == EOF" to determine success or failure. SEE ALSO
ferror(3), fputws(3), putc(3), stdio(3) STANDARDS
The functions fputs() and puts() conform to ISO/IEC 9899:1990 (``ISO C90''). While not mentioned in the standard, both fputs() and puts() print '(null)' if str is NULL. BSD
June 4, 1993 BSD
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