C Reference Printing Character Test (not space): isgraph()

The function isgraph() checks if parameter is a character with graphical representation that can be printed. Whitespace characters like space are skipped. If the argument is not, then zero is returned.

isgraph() source code example:

#include<stdio.h>
#include<ctype.h>

int main()
{
	FILE * ptr_file;
	int a;

	ptr_file=fopen ("file.txt","r");

	if (ptr_file)
	{
		do {
			a = fgetc (ptr_file);
			if ( isgraph(a) ) putchar (a);
		} while (a != EOF);
		fclose (ptr_file);
	}
	return 0;
}

Note: The content (all characters) of “file.txt” will be printed (spaces and special characters are not.)