#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

int main(int argc, char *argv[]) {
    FILE *fp;
    int ch;
    int in_word = 0;     // Flag: 1 if inside a word, 0 otherwise
    long word_count = 0;

    // Check for correct usage
    if (argc != 2) {
        printf("Usage: %s <filename>\n", argv[0]);
        return 1;
    }

    // Open file in read mode
    fp = fopen(argv[1], "r");
    if (fp == NULL) {
        perror("Error opening file");
        return 1;
    }

    // Read character by character
    while ((ch = fgetc(fp)) != EOF) {
        if (isspace(ch)) {
            // Whitespace ends a word
            in_word = 0;
        } else if (!in_word) {
            // Start of a new word
            in_word = 1;
            word_count++;
        }
    }

    fclose(fp);
    printf("Total number of words: %ld\n", word_count);

    return 0;
}