C语言库isprint()函数

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

int main () {
   int var1 = 'k';
   int var2 = '8';
   int var3 = '	';
   int var4 = ' ';

   if( isprint(var1) ) {
      printf(var1 = |%c| can be printed\n, var1 );
   } else {
      printf(var1 = |%c| can't be printed\n, var1 );
   }

   if( isprint(var2) ) {
      printf(var2 = |%c| can be printed\n, var2 );
   } else {
      printf(var2 = |%c| can't be printed\n, var2 );
   }

   if( isprint(var3) ) {
      printf(var3 = |%c| can be printed\n, var3 );
   } else {
      printf(var3 = |%c| can't be printed\n, var3 );
   }

   if( isprint(var4) ) {
      printf(var4 = |%c| can be printed\n, var4 );
   } else {
      printf(var4 = |%c| can't be printed\n, var4 );
   }

   return(0);
}