something basic

"Hello, World!\n"; → A string literal. The \n is an escape sequence that inserts a newline after printing.

#include <iostream>

using namespace std;   // brings all names from std into scope

int main() {

    cout << "Hello" << endl;       // works because of 'using namespace std;'

    std::cout << "World" << std::endl; // also works, fully qualified

    return 0;

}