w3resource

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:

Name Description Required /Optional
ch ch is a character of class graph in the current locale. Required

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

C Programming Code Editor:

Contribute your code and comments through Disqus.

Previous C Programming: C isgraph()
Next C Programming: C islower()



Follow us on Facebook and Twitter for latest update.

C Programming: Tips of the Day

Reading a string with scanf :

An array "decays" into a pointer to its first element, so scanf("%s", string) is equivalent to scanf("%s", &string[0]). On the other hand, scanf("%s", &string) passes a pointer-to-char[256], but it points to the same place.

Then scanf, when processing the tail of its argument list, will try to pull out a char *. That's the Right Thing when you've passed in string or &string[0], but when you've passed in &string you're depending on something that the language standard doesn't guarantee, namely that the pointers &string and &string[0] -- pointers to objects of different types and sizes that start at the same place -- are represented the same way.

Ref : https://bit.ly/3pdEk6f