//Declaration: int ispunct(int ch); //Return: returns nonzero if ch is a punctuation character; otherwise zero is returned. #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; } /* fd d w s d . . is punctuation */