C isgraph() function

C isgraph(int ch)

The isgraph() function is used to check whether a character is a graphic character or not. The function is defined in the ctype.h header file.

Note: In ISO/IEC 646 and related standards including ISO 8859 and Unicode, a graphic character is any character intended to be written, printed, or otherwise displayed in a form that can be read by humans. In other words, it is any encoded character that is associated with one or more glyphs

Syntax:

int isgraph(int argument);

isgraph() Parameters:

Return value from isgraph()

• The isgraph() function returns non-zero if ch is a character with a visible representation; otherwise, returns 0.

Example-1: Check graphic character

#include <stdio.h>
#include <ctype.h>
int main()
{
    char ch;
    ch = ' ';
    printf("\nIf %c is graph character or not? %d", ch, isgraph(ch));
    ch = '\n';
    printf("\nIf %c is graph character or not? %d", ch, isgraph(ch));
    ch = '5';
    printf("\nIf %c is graph character or not? %d", ch, isgraph(ch));
}

Output:

If   is graph character or not? 0
If
 is graph character or not? 0
If 5 is graph character or not? 4

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