C++ How do I hide a console window on startup?

To literally hide/show the console window on demand, you could use the following functions:
It’s possible to hide/show the console by using ShowWindow. GetConsoleWindow retrieves the window handle used by the console.
IsWindowVisible can be used to checked if a window (in that case the console) is visible or not.

#include <Windows.h>

void HideConsole()
{
    ::ShowWindow(::GetConsoleWindow(), SW_HIDE);
}

void ShowConsole()
{
    ::ShowWindow(::GetConsoleWindow(), SW_SHOW);
}

bool IsConsoleVisible()
{
    return ::IsWindowVisible(::GetConsoleWindow()) != FALSE;
}