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

int main(int argc, char* argv[]) {
    // Create a text file containing "Yo!" plus a null terminator (weird thing to do).
    FILE* fp = fopen("j.txt", "w");
    fprintf(fp, "Yo!");
    fputc('\0', fp);  // This is WEIRD.  Normally:  Do not write '\0' to a text file.
    fclose(fp); // RULE:  If you open a file, you must close it (once).

    // Read the file, one character at a time.
    printf("Here are the characters:\n");
    printf("________________________\n");
    fp = fopen("j.txt", "r");   // mode "r" means we want to read a file.  "a" means append to the end
    for(char ch = fgetc(fp); ! feof(fp); ch = fgetc(fp)) {
        printf("character value:  %02x   %d\n", ch);  // %02x means hex >= 2 digits
    }
    fclose(fp); // RULE:  If you open a file, you must close it (once).
    printf("\n------------------------\n");

    return EXIT_SUCCESS;
}
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