writing in a file character by character using fputc

#include<stdio.h>

int main()

{

    FILE *ptr;

    ptr=fopen("hel.txt","w");

    fputc('a',ptr);

        fputc('b',ptr);

    fputc('h',ptr);

    fputc('i',ptr);

    fclose(ptr);

    return 0;

}