KnRBookExercises/Chapter1/ex1-13.c

/*
 * Exercise 1-13. Write a program to print a histogram of the lengths of
 * words in its input. It is easy to draw the histogram with the bars
 * horizontal; a vertical orientation is more challenging.
 */
#include <stdio.h>

#define IN 1
#define OUT 0

main()
{
        int c, state;
        state = OUT;
        while ((c = getchar()) != EOF) {
                if (c == ' ' || c == '\n' || c == '\t') {
                        state = OUT;
                        continue;
                } else if (state == OUT) {
                        state = IN;
                        putchar('\n');
                }
                if (state == IN) {
                        putchar('*');
                }
        }
}