- Operator (C# Reference)

The - operator can function as either a unary or a binary operator.

Unary - operators are predefined for all numeric types. The result of a unary - operation on a numeric type is the numeric negation of the operand.

Binary - operators are predefined for all numeric and enumeration types to subtract the second operand from the first.

Delegate types also provide a binary - operator, which performs delegate removal.

User-defined types can overload the unary - and binary - operators. For more information, see operator (C# Reference).

class MinusLinus
{
    static void Main()
    {
        int a = 5;
        Console.WriteLine(-a);
        Console.WriteLine(a - 1);
        Console.WriteLine(a - .5);
    }
}
/*
Output:
-5
4
4.5
*/

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