[Intro] main.cpp

// include a header from the standard library
#include <iostream>

// declare the "main(int,char*[])" entrypoint
// note use of [[maybe_unused]] attribute to prevent compiler warnings
int main([[maybe_unused]] int argc, [[maybe_unused]] char* argv[])
{
    // output string to "std::cout", the "standard out" stream
    std::cout << "Hello, World!" << std::endl;

    // return an exitcode (zero for "OK")
    return 0;
}