1-13.c

//K&R2 Exercise 1-13 "Histogram of word lengths"

#include <stdio.h> 
#define OUT 0
#define IN 1
#define MAX_WORD_LENGTH 20

main() 
{
	int c = 0, wl = 0, i = 0;
	int wc[MAX_WORD_LENGTH];
	int state = OUT;

	for(i = 0; i < MAX_WORD_LENGTH; i++)
		wc[i] = 0;

	while((c = getchar()) != EOF) {
		if(c == ' ' || c == '"' || c == '\n')
			state = OUT;
		else
			state = IN;

		if(state == IN)
			wl++;
		else if(state == OUT && wl > 0) {
			if(wl > MAX_WORD_LENGTH)
				wl = MAX_WORD_LENGTH - 1;
			wc[wl]++;
			wl = 0;
		}
	}

	for(i = 0; i < MAX_WORD_LENGTH; i++){
		printf("%3d:", i);
		while(wc[i] != 0){
			putchar('|');
			wc[i]--;
		}
		putchar('\n');
	}
}