#include <stdio.h>
#include <wchar.h>
#include <locale.h>
#include <io.h>
#include <fcntl.h>
#include <stdlib.h>

int main() {

    char message[] = "hello world";

    char filename[] = "aboba.txt";

    FILE* fp;

    if(fopen_s(&fp, &filename, "w") == 0) {

        if (fputs(message, fp) == EOF) {
            perror("WRITE FILE ERROR");
            return 3;
        };

        if (fclose(fp) == EOF) {
            perror("CLOSE FILE ERROR");
            return 2;
        }
    }
    else {
        perror("OPEN FILE ERROR");
        return 1;
    }

    char buffer[256];

    if (fopen_s(&fp, filename, "r") == 0) {
        if (fgets(buffer, 256, fp) == EOF) {
            perror("READ FILE ERROR");
            return 4;
        }
        if (fclose(fp) == EOF) {
            perror("CLOSE FILE ERROR");
            return 2;
        }
    }
    else {
        perror("OPEN FILE ERROR");
        return 1;
    }

    printf("%s", buffer);

    return 0;
}