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%= Operator (C# Reference)

The modulus assignment operator.

An expression using the %= assignment operator, such as

x %= y

is equivalent to

x = x % y

except that x is only evaluated once. The % operator is predefined for numeric types to compute the remainder after division.

The %= operator cannot be overloaded directly, but user-defined types can overload the % operator (see operator (C# Reference)).

// cs_operator_modulus_assignment.cs
using System;
class MainClass
{
    static void Main() 
    {
        int a = 5;
        a %= 3;
        Console.WriteLine(a);
    }
}
 
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