#include <iostream>

// Why does this source code not compile?
//
// First, examine the code and try to
// identify the problem without compiling it.
//
// If you cannot find the problem, compile
// the code and use the compiler's error
// message as a hint.
//
// If you still cannot find the problem,
// scroll down.

// Function declaration
int main();

// Function definition
int min() {
    std::cout << "Hello World!"
              << std::endl;

    return 0;
}



































































// A C++ program must define a function
// called 'main'. This program only
// declares 'main':
//
// int main();
//
// The function definition
//
// int min() {
//
// defines a different function called
// 'min', not 'main'. Consequently, the
// linker cannot find the definition of
// 'main' needed to create the executable.