ispunct() - ctype.h

The C library function int ispunct(int c) checks whether the passed character is a punctuation character. A punctuation character is any graphic character (as in isgraph) that is not alphanumeric (as in isalnum).
This function returns a non-zero value(true) if c is a punctuation character else, zero (false).

Syntax

int ispunct(int c);

Example

#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);
}

Output / Return Value

var1 = |t| is not a punctuation character
var2 = |1| is not a punctuation character
var3 = |/| is a punctuation character
var4 = | | is not a punctuation character

Limitations

Alternatives / See Also

Reference