begin
var a := 1;
var b := 2;
Println(a, b);//1 2
a := a + b;
b := a - b;
a := a - b;
Print(a, b)//2 1
end.
begin
var a := 1;
var b := 2;
Println(a, b);//1 2
a := a + b;
b := a - b;
a := a - b;
Print(a, b)//2 1
end.