# Variable Swap Problem

Someone suggested this problem to me a while back: Swap x and y integers, 6 and 248, without using an extra variable. I was already working on my XOR solution, similar to how RAID 5 and one pad key encryption works, when she told me I could use XOR. I almost had it! But anyway this is the solution I came up with:

[TestMethod]

public void NoExtraVariables_Swap_XY()

{

int x = 6;

int y = 248;

x ^= y;

y ^= x;

x ^= y;

Assert.AreEqual(248, x);

Assert.AreEqual(6, y);

}

[TestMethod]

public void NoExtraVariables_Swap_XY()

{

int x = 6;

int y = 248;

x ^= y;

y ^= x;

x ^= y;

Assert.AreEqual(248, x);

Assert.AreEqual(6, y);

}