ispunct : ispunct « ctype.h « C Tutorial

1. C Tutorial
2. ctype.h
3. ispunct

"punctuation" includes all printing characters that are neither alphanumeric nor a space.

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

  int main(void)
  {
    char ch;

    for(;;) {
      ch = getchar();
      if(ispunct(ch)){
         printf("%c is punctuation\n", ch);
      }
      if(ch == '.'){
         break;
      }
    }

    return 0;
  }

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. is punctuation