Hello, world! is often the first program that we write in a new programming language. It helps us to understand the most basic application syntax and is a good way to test our tool chain to make sure that we can compile and/or run a program.
HelloWorld.cpp
//
// Simple first program.
//
#include <iostream>
#include <string>
using namespace std;
int main(int argc, char **argv) {
cout << "Hello, world!" << endl;
return 0;
}