Hi !
Welcome to G4EF

Change your code to something like :

Code: CPP
#include <iostream>

using namespace std;

int main()
{
    cout << "Hello World!";
    getchar()
    return 0;
}
BTW, any C++ compiler would behave the same way as yours, it's not about a fast compiler.
Your code basically prints "Hello World!" and then exits, so you fail to see the output.
If you instruct it to wait for a key-stroke before exiting (getchar ()), you can have your output on screen, till you press a key.