표준 출력을 fwrite, write로 구현하기

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

int main(void) {
   FILE *fp;
    printf("Hello!\n");

    fwrite("Hello!\n", sizeof(char), strlen("Hello!\n"), stdout);

    write(1, "Hello!\n", sizeof(char)*strlen("Hello!\n"));

   fwrite("Hello!\n", sizeof(char), strlen("Hello!\n"), fp);
    fclose(fp);

}