ch1/1-12_one-word-per-line.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

#include <stdio.h>

/* The C Programming Language, 2nd Edition
 *
 * Exercise 1-12: Write a program that prints its input one word per line.
 *
 * Answer: Be sure to output letters when you're in a word, and a newline when
 * you're out of one.
 */

#define IN 1
#define OUT 0

int main(void) {
	int c, nl, nw, nc, state;
	state = OUT;
	nl = nw = nc = 0;
	while ((c = getchar()) != EOF) {
		nc++;
		if (c == '\n') {
			nl++;
		}
		if (c == ' ' || c == '\n' || c == '\t') {
			if (state == IN) {
				state = OUT;
				putchar('\n');
			}
		} else if (state == OUT) {
			state = IN;
			nw++;
		}
		if (state == IN) {
			putchar(c);
		}
	}
	printf("%d %d %d\n", nl, nw, nc);
	return 0;
}