C library function - isgraph()

Description

The C library function void isgraph(int c) check if character has graphical representation.

The characters with graphical representation are all those characters that can be printed except for whitespace characters (like ' '), which is not considered as isgraph characters.

Declaration

Following is the declaration for isgraph() function.

int isgraph(int c);

Parameters

• c -- This is the character to be checked.

Return Value

This function returns nonzero value if c has graphical representation as character, else 0

Example

The following example shows the usage of isgraph() function.

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

int main()
{
   int var1 = '3';
   int var2 = 'm';
   int var3 = ' ';
    
   if( isgraph(var1) )
   {
       printf("var1 = |%c| can be printed\n", var1 );
   }
   else
   {
      printf("var1 = |%c| can't be printed\n", var1 );
   }
   if( isgraph(var2) )
   {
       printf("var2 = |%c| can be printed\n", var2 );
   }
   else
   {
      printf("var2 = |%c| can't be printed\n", var2 );
   }
   if( isgraph(var3) )
   {
       printf("var3 = |%c| can be printed\n", var3 );
   }
   else
   {
      printf("var3 = |%c| can't be printed\n", var3 );
   }
   
   return(0);
}

Let us compile and run the above program, this will produce the following result:

var1 = |3| can be printed
var2 = |m| can be printed
var3 = | | can't be printed