include <stdio.h>

define SWAP1(a,b) \

{
int temp = a;
a = b;
b = temp;
}

define SWAP2(a,b) \

{
a = a + b;
b = a - b;
a = a - b;
}

define SWAP3(a,b) \

{
a = a ^ b;
b = a ^ b;
a = a ^ b;
}