program hoandoi;
uses crt;
var x,y,tam:integer;
begin
clrscr;
write('Nhap gia tri x=');readln(x);
write('Nhap gia tri y=');readln(y);
tam:=x;
x:=y;
y:=tam;
writeln('Gia tri sau khi hoan doi cua x la ',x);
writeln('Gia tri sau khi hoan doi cua y la ',y);
readln;
end.