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isgraph() C library function

  • Difficulty Level : Easy
  • Last Updated : 24 Oct, 2017
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The C library function isgraph() checks whether a character is a graphic character or not.
Characters that have graphical representation are known are graphic characters. For example: ‘:’ ‘;’ ‘?’ ‘@’ etc.

Syntax –

#include <ctype.h>
int isgraph(int ch);

Return Value – function returns nonzero if ch is any printable character other than a space, else it returns 0.

For ASCII environments, printable characters are in the range of 0X21 through 0X7E.

Code –

// code to check graphical character
#include <stdio.h>
#include <ctype.h>
int main()
    char var1 = 'g';
    char var2 = ' ';
    char var3 = '1';
    if (isgraph(var1)) 
        printf("var1 = |%c| can be printed\n", var1);
        printf("var1 = |%c| can't be printed\n", var1);
    if (isgraph(var2)) 
        printf("var2 = |%c| can be printed\n", var2);
        printf("var2 = |%c| can't be printed\n", var2);
    if (isgraph(var3)) 
        printf("var3 = |%c| can be printed\n", var3);
        printf("var3 = |%c| can't be printed\n", var3);
    return (0);

Output –

var1 = |g| can be printed
var2 = | | can't be printed
var3 = |1| can be printed

Code –

// code to print all Graphical Characters
#include <stdio.h>
#include <ctype.h>
int main()
    int i;
    printf("In C programming All graphic "
            "characters are: \n");
    for (i = 0; i <= 127; ++i) 
        if (isgraph(i) != 0)
            printf("%c ", i);    
    return 0;

Output –

In C programming All graphic characters are: 
! " # $ % & ' ( ) * +, - . / 0 1 2 3 4 5 6 7 8 9 
: ;  ? @ A B C D E F G H I J K L M N O P Q R S T U
 V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n
 o p q r s t u v w x y z { | } ~ 

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