Function
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Overview
A function is a declaration of a routine which may be invoked
- from within the unit that declares it
- from outside the unit if the function is public,
- or from within a program
The routine returns a value as part of its definition. A routine that does not return a value as part of its definition is a procedure.
A function which is part of an object is called a property and can be assigned/return a value (if you can't assign a value, it would be a method)
Examples
Addition of two integers example:
function add(c1, c2 : integer) : integer;
begin
add := c1 + c2; //or use result := in Object Pascal/Delphi mode
end;
var
total: integer;
begin
total := add(4, 5);
writeln (total); // result is 9
end.