关于 pascal中标准函数swap(x,y)pascal的解释?

Question

例求两数的最小公倍数function lcm(a,b:integer):integer;beginif a<b then swap(a,b);lcm:=a;while lcm mod b>0 do inc(lcm,a);end;

Answer 1

Exchanges high order byte with the low order byte of an integer or word.

Unit

System

Category

backward compatibility routines

Delphi syntax:

function Swap(X);

Description

In Delphi code, Swap exchanges the high-order bytes with the low-order bytes of the argument. X is an expression of type SmallInt, as a 16-bit value, or Word. This is provided for backward compatibility only.

Answer 2

交换a,b两变量的值
swap(a,b)实际上就是
t:=a;//t为临时变量
a:=b;
b:=t;