C/C++ program to print Hello World without using main() and semicolon

The task is to write a program to print Hello World without using main() and semicolon. As we already know, how to print Hello World without the use of a semicolon. Now, for writing without main() method, we will need a Macro. 

// C program to print Hello World
// without using main() and semicolon

#include <stdio.h>

#define x main

void x()
{
    if (printf("Hello World")) {
    }
}

// C++ program to print Hello World
// without using main() and semicolon

#include <bits/stdc++.h>
using namespace std;

#define x main

void x()
{
    if (cout << "Hello World") {
    }
}

Hello World

Time Complexity: O(1)
Auxiliary Space: O(1)