Easiest way to output and input in C++ code example

Example 1: how to cout in c++

std::cout << "Hello World!" << std::endl; //Or you can do
std::cout << "Hello World!" <<; //Only in some scenarios

Example 2: c++ output

#include <iostream>

int main(){
  std::cout << "Hello World!" << std::endl; // prints "Hello World"
}