#include <stdio.h>
#include <string.h>

int main(int argc, char const *argv[]) {
    char hello[] = "hello world";
    
    FILE *fp = fopen("hello.txt", "w");
   
    if (fp) {
        fwrite(hello, 1, strlen(hello), fp);
        fclose(fp);
    }
    return 0;
}