K&R C Language -- Exercise 1-9

#include <stdio.h>

/* Copy input to output, converting multiple blanks to one blank */
main()
{
    int c;

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