A parameter declaration tells the compiler the name of the function and the number, type and order of parameters utilized in that function. It is a composed of a series of parameters, contained in parenthesis, delimited by commas, with the other identifying information such as type and order. It is sometimes called an argument declaration. The parameter declaration can be contained in either the same source code file along with the function or procedure or it can be contained in a separate file and included in the source code file for the function using some sort of include directive. Parameter declarations are sometimes incorporated into lists such as parameter lists. In these lists parameter declarations are separated by a semicolon.

There are several types of parameter declarations. Two types are constant or value parameter declaration, and variable or a reference parameter declaration. A constant parameter declaration...