How to use exit ()?

Question

Which header file should be included?

Answer 1

not sure which programming language you are referring to but I think cstdlib should work for c++

example:
#include <cstdlib>
#include <iostream>

using namespace std;

int main()
{
cout<<"Program will exit";
exit(1); // Returns 1 to the operating system

cout<<"Never executed";
}