c_ch01_ex09.c

/*
 * Exercise 1-9.
 * Write a program to copy its input to its output, replacing
 * each string of one or more blanks by a single blank.
 */

#include <stdio.h>

main() {
	int c, pc;

	/*
	 * set the previous character to anything
	 * other than blank
	 */

	pc = 'A';

	while ((c = getchar()) != EOF) {
		if (c == ' ' && pc == ' ')
			;
		else {
			putchar(c);
			pc = c;
		}
	}

}