Function Declarations

Declaration of a function in C++

Before we discuss calling functions, we must discuss declarations. Programs written in C++ are executed in logical order from the top down. A statement can only use symbols, or named constructs like functions, that are declared in code that has already been executed. Simply put, the compiler must be aware of the name used to describe a function before that function can be called in the code.

For example, to allow main to call functions that are ...