isgraph() - ctype.h

The C library function void isgraph(int c) checks if the character has graphical representation.
The characters with graphical representations are all those characters that can be printed except for whitespace characters (like ' '), which is not considered as isgraph characters.
This function returns non-zero value if c has a graphical representation as character, else it returns 0.

Syntax

int isgraph(int c);

Example

#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);
}

Output / Return Value

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

Limitations

Alternatives / See Also

Reference