I can also run and get result with this way output of hello world?

Question

include<stdio.h>
int main()
{
printf("hello world !\n");
return 0;
}

Answer 1

Yes you may. Note that this is, however, the C way of doing it. If you are going for C++ and want to use printf() function, while <stdio.h> is working, it is encouraged to use <cstdio> instead.