#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).  This
    // time, we create the file using an int to get the right bytes in there.  This is just for
    // demonstration to make the point in the lecture, that it's all just bytes.
    FILE* fp = fopen("n.txt", "w");
    int n = 0x0a216f59;  // changing first byte of the int to 0x0a ('\n') so that end of string will be '\n'.
    // internally, it will be 0x59 0x6f 0x21 0x0a
    int* a_n = &n;
    fwrite(a_n, sizeof(*a_n), 1, fp);
    fclose(fp); // RULE:  If you open a file, you must close it (once).

    fp = fopen("n.txt", "r");
    for(char ch = fgetc(fp); ! feof(fp); ch = fgetc(fp)) {
        fputc(ch, stdout);  // print just one character
    }
    printf("------------------------------\n");

    return EXIT_SUCCESS;
}
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