count words

$ cat countwords.c

#include<stdio.h>

#define IN 1
#define OUT 0

int main() {
  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')
      state = OUT;
    else if (state == OUT) {
      state = IN;
      ++nw;
    }
  }
  printf("%d %d %d\n", nl, nw, nc);
}

$ gcc-9 -Wall -o countwords countwords.c
$ cat countwords.c | ./countwords
24 74 371
$ ./countwords < countwords.c
24 74 371