Easy programming puzzle

[WhiteCube]

Variables X and Y hold integers.

Swap the values of X and Y without using a third variable.

Spoiler: one answer

X=(X xor Y)
Y=(X xor Y)
X=(X xor Y)

 

[VBService]

X = X + Y  # Now X holds the sum of X and Y
Y = X - Y  # Subtract Y from the sum, so Y becomes the original X
X = X - Y  # Subtract the new Y (original X) from the sum, so X becomes the original Y

[ working code on-line ]

X = -5
Y = 2

print(f"X = {X}, Y = {Y}")

X = X + Y  # Now X holds the sum of X and Y
Y = X - Y  # Subtract Y from the sum, so Y becomes the original X
X = X - Y  # Subtract the new Y (original X) from the sum, so X becomes the original Y

print(f"X = {X},  Y = {Y}")