Scala - Bitwise XOR and assignment operator

The Bitwise XOR and assignment operator (^=) assigns the first operand a value equal to the result of Bitwise XOR operation of two operands.

(x ^= y) is equivalent to (x = x ^ y)

The Bitwise XOR operator (^) is a binary operator which takes two bit patterns of equal length and performs the logical exclusive OR operation on each pair of corresponding bits. It returns 1 if only one of the bits is 1, else returns 0.

Bit_1Bit_2Bit_1 ^ Bit_2
000
101
011
110

The example below describes how bitwise XOR operator works:

50 ^ 25 returns 43

50    ->    110010  (In Binary)
^ 25    ->  ^ 011001  (In Binary)
----        --------
43    <-    101011  (In Binary)

The code of using Bitwise XOR and assignment operator (^=) is given below:

object MainObject {
def main(args: Array[String]) {
var x = 50
var y = 25

//Bitwise XOR and assignment operation
x ^= y

//Displaying the result
println("x = " + x)
}
}

The output of the above code will be:

x = 43

Example: Swap two numbers without using temporary variable

The bitwise XOR and assignment operator can be used to swap the value of two variables. Consider the example below.

object MainObject {
def main(args: Array[String]) {
var x = 10
var y = 25

println("Before Swap:")
println("x = " + x)
println("y = " + y)

//Swap technique
x ^= y
y ^= x
x ^= y

println("\nAfter Swap:")
println("x = " + x)
println("y = " + y)
}
}

The above code will give the following output:

Before Swap:
x = 10
y = 25

After Swap:
x = 25
y = 10

❮ Scala - Operators

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