Exercise 1.9 - Replace Continous blanks with a single blank¶

/**
 * 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>

#define NONBLANK '-'

int main(void) {
    int c, lastc;

    lastc = NONBLANK;

    while ((c = getchar()) != EOF) {
        if (c == ' ') {
            if (lastc != ' ')
                putchar(c);
        } else
            putchar(c);
        lastc = c;
    }
    return 0;
}