/= Operator
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/= Operator (C# Reference)

The division 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 perform division.

The /= operator cannot be overloaded directly, but user-defined types can overload the / operator (see operator). On all compound assignment operators, overloading the binary operator implicitly overloads the equivalent compound assignment.

// cs_operator_division_assignment.cs
using System;
class MainClass
    static void Main() 
        int a = 5;
        a /= 6;
        double b = 5;
        b /= 6;


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