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

int main(int argc, char* argv[]) {
    // fopen returns NULL if an error occured
    //FILE* file = fopen("new_file.txt", "r");
    FILE* file = fopen("file_does_not_exist.txt", "r");
    if (file != NULL) {
        char ch = fgetc(file);

        // fputc returns EOF if unsuccessful
        if (fputc('A', file) == EOF) {
            // print the fputc error
            // ferror(file) returns the last error from file
            printf("Error %d occured:\n%s\n",
                    ferror(file), strerror(ferror(file)));  
        }

        printf("Character %c\n", ch);

        fclose(file);
    } else {
        // print the fopen error
        // errno contains the last error that C received
        printf("Error %d occured:\n%s\n", errno, strerror(errno));  
    }
    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */