What is the difference between false and FALSE?

Question

In many programs, I see statements with the identifiers FALSE and false. Is there any difference between them in the context of C++?

Also in so

Answer 1

FALSE is not defined in the standard. Only false is. true and false are called "Boolean literals", and are keywords in C++.

FALSE is sometimes defined as a macro. You can't rely on it being present on a standards-compliant environment as it is not part of the standard.

In other words, the following program is valid C++:

#include 

#define FALSE 1

int main()
{
    bool a = false;
    bool b = FALSE;
    std::cout << a << " " << b << std::endl;
    return 0;
}

and it will print 0 1 as expected. FALSE is not a privileged symbol in any way.