<C Primer Plus>11 A Word-Count Program

#include <stdio.h>
#include "ctype.h"
#define STOP  '|'
int main(void){
    char c;//Initializing
    long n_char = 0L;
    int n_word = 0;
    int n_line = 0;
    int inword = 0;//This is a flag making sure in word or not .
    
    while ((c = getchar()) != STOP){//
        n_char++;
        if (c == '\n'){
            n_line++;
        }
        if (!isspace(c) && !inword){//c = getchar(), isn't space and not in word.
            inword = 1;
            n_word++;
        }
        if (isspace(c) && inword){// c is space and in word.
            inword = 0;
        }
    }
    printf("characters = %ld, word = %d, line = %d", n_char, n_word, n_line);

    return 0;
}