Characters that have graphical representation are known are graphic characters.
The isgraph() checks whether a character is a graphic character or not. If the argument passed to isgraph() is a graphic character, it returns a non-zero integer. If not, it returns 0.
This function is defined in ctype.h header file
Function prototype of isgraph()
int isgraph(int argument);
The isgraph() function takes a single argument and returns an integer.
When character is passed as an argument, corresponding ASCII value of the character is passed instead of that character itself.
Example #1: Check graphic character
#include <stdio.h>
#include <ctype.h>
int main()
{
char c;
int result;
c = ' ';
result = isgraph(c);
printf("When %c is passed to isgraph() = %d\n", c, result);
c = '\n';
result = isgraph(c);
printf("When %c is passed to isgraph() = %d\n", c, result);
c = '9';
result = isgraph(c);
printf("When %c is passed to isgraph() = %d\n", c, result);
Output
When is passed to isgraph() = 0 When is passed to isgraph() = 0 When 9 is passed to isgraph() = 1
Example #2: Print all graphic characters
#include <stdio.h>
#include <ctype.h>
int main()
{
int i;
printf("All graphic characters in C programming are: \n");
for (i=0;i<=127;++i)
{
if (isgraph(i)!=0)
printf("%c ",i);
}
return 0;
}
Output
All graphic characters in C programming 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 { | } ~