#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <stdbool.h>
#include "clog.h"

// Get size of file using ftell(…).
//
// ftell(fp) tells you the current position of fp.

char const* write_file(char const* s, char const* filename) {
    FILE* fp = fopen(filename, "w");
    fputs(s, fp);
    fclose(fp);
    return filename;
}

int main(int argc, char* argv[]) {
    char const* filename = "d.txt";

    write_file("ABC", filename);

    // Open file
    FILE* fp = fopen(filename, "r");

    // Set position to end of file.
    fseek(fp, 0, SEEK_END);

    // Get current position.
    int num_chars_in_file = ftell(fp);// get current position relative to beginning of file

    // Close file.
    fclose(fp);

    // Report answer.
    printf("There are %d characters in file \"%s\".\n", num_chars_in_file, filename);

    return EXIT_SUCCESS;
}
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