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^= Operator (C# Reference)

The exclusive-OR assignment operator.

An expression of the form

x ^= y

is evaluated as

x = x ^ y

except that x is only evaluated once. The ^ operator performs a bitwise exclusive-OR operation on integral operands and logical exclusive-OR on bool operands.

The ^= operator cannot be overloaded directly, but user-defined types can overload the ! operator (see operator).

// cs_operator_xor_assignment.cs
using System;
class MainClass
{
    static void Main() 
    {
        int a = 0x0c;
        a ^= 0x06;
        Console.WriteLine("0x{0:x8}", a);
        bool b = true;
        b ^= false;
        Console.WriteLine(b);
    }
}
 
0x0000000a
True
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