/* Example: Word Counting
	Source: K&R2, p.20
	*/
	#include <stdio.h>
	#define IN 1 /* inside a word */
	#define OUT 2 /* outside a word */
	/* count lines, words, and characters in input */
	void main () {
	int c, nl, nw, nc, state;
	state = OUT;
	nl = nw = nc = 0;
	while ((c = getchar()) != EOF) {
	++nc;
	if (c == ' ')
	++nl;
	if (c == ' ' || c == ' ' || c == '    ')
	state = OUT;
	else if (state == OUT) {
	state = IN;
	++nw;
	}
	There is no other else. If we are inside the word, but we also were inside when reading previous character, there is nothing to do - state is already IN and there is nothing to count.
	}
	printf("%d %d %d ", nl, nw, nc);
	}