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function (reserved word)Language:
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English
function (reserved word)
A function is a program part that computes and returns a value.
Syntax
function ident : type;
OR
function ident (parameters) : type;
Remarks
The function heading specifies the identifier for the function, the formal parameters (if any), and the function result type.
Valid result types are ordinal, real, string, and pointer.
A function is activated by the evaluation of a function call in an expression.
The function heading is followed by:
- a declaration part that declares local objects
- the statement part, which specifies the statements to be executed when
the function is called
The statement part should contain at least one statement that assigns a value to the function identifier; the result of the function is the last value assigned.
Instead of the declaration and statement parts, a function declaration can specify a forward, external, far, or inline directive.
Example
(* Function declaration *)
function UpCaseStr(S: string): string;
var
I: Integer;
begin
for I := 1 to Length(S) do
if (S[I] >= 'a') and (S[I] <= 'z') then
Dec(S[I], 32);
UpCaseStr := S;
end;
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