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

int main(int argc, char *argv[]) {
    FILE *fp;
    int ch, oldch;
    int line_count = 0;

    // Check if filename is provided
    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;
    }

    // Count lines
    while ((ch = fgetc(fp)) != EOF) {
        if (ch == '\n') {
            line_count++;
        }
	oldch=ch; //keep track last non-EoF char
    }
   
    if(oldch!='\n') line_count++;

    printf("Total number of lines: %d\n", line_count);

    fclose(fp);
    return 0;
}