C语言ispunct()库函数

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

int main () {
   int var1 = 't';
   int var2 = '1';
   int var3 = '/';
   int var4 = ' ';

   if( ispunct(var1) ) {
      printf("var1 = |%c| is a punctuation character\n", var1 );
   } else {
      printf("var1 = |%c| is not a punctuation character\n", var1 );
   }

   if( ispunct(var2) ) {
      printf("var2 = |%c| is a punctuation character\n", var2 );
   } else {
      printf("var2 = |%c| is not a punctuation character\n", var2 );
   }

   if( ispunct(var3) ) {
      printf("var3 = |%c| is a punctuation character\n", var3 );
   } else {
      printf("var3 = |%c| is not a punctuation character\n", var3 );
   }

   if( ispunct(var4) ) {
      printf("var4 = |%c| is a punctuation character\n", var4 );
   } else {
      printf("var4 = |%c| is not a punctuation character\n", var4 );
   }

   return(0);
}