C Programming - C Preprocessor
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You can easily solve C Programming quiz problems based on "C Preprocessor" by practising the given exercises, including shortcuts and tricks.
#include<stdio.h>
#define SWAP(a, b, c)(c t; t=a, a=b, b=t)
int main()
{
int x=10, y=20;
SWAP(x, y, int);
printf("%d %d\n", x, y);
return 0;
}
#include<stdio.h>
gets replaced by the contents of the file stdio.h
The preprocessor replaces the line #include <stdio.h> with the system header file of that name. More precisely, the entire text of the file 'stdio.h' replaces the #include directive.