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

void _write_file(char const* filename, char const* text) {
    FILE* file = fopen(filename, "w");
    fputs(text, file);
    fclose(file);
}

int main(int argc, char* argv[]) {
    _write_file("read.txt", "abc\n\xff");   

    FILE* file = fopen("read.txt", "r");

    char ch = fgetc(file);
    printf("Found character '%c', ascii value %d\n", ch, ch);
    ch = fgetc(file);
    printf("Found character '%c', ascii value %d\n", ch, ch);
    ch = fgetc(file);
    printf("Found character '%c', ascii value %d\n", ch, ch);
    ch = fgetc(file);
    printf("Found character '%c', ascii value %d\n", ch, ch);
    ch = fgetc(file);
    printf("Found character '%c', ascii value %d\n", ch, ch);
    // this is misleading, because we cannot distinguish
    // EOF from ascii value 255
    if (ch == EOF) {
        printf("At end of file\n");
    }
    int ch_4_bytes = fgetc(file);
    printf("Found character '%c', ascii value %d\n", num, num);
    // this is not misleading, because now ascii 255
    // is stored as 255, and EOF is stored as -1
    if (ch_4_bytes == EOF) {
        printf("At end of file\n");
    }

    fclose(file);

    return EXIT_SUCCESS;
}
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