Mikroelektronika MIKROE-742 데이터 시트

A function can be declared without having it followed by it's implementation, by hav-
ing it followed by the forward procedure. The effective implementation of that func-
tion must follow later in the unit. The function can be used after a forward declara-
tion as if it had been implemented already. The following is an example of a forward
declaration:

program Volume;

var Volume : word;

function First(a, b : word) : word; forward;

function Second(c : word) : word;
var tmp : word;
begin

tmp := First(2, 3);

result := tmp * c;

function First(a, b : word) : word;
begin

result := a * b;

Volume := Second(4);

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6