-- Operator (C# Reference)
The decrement operator (--) decrements its operand by 1. The decrement operator can appear before or after its operand: --variable and variable--. The first form is a prefix decrement operation. The result of the operation is the value of the operand "after" it has been decremented. The second form is a postfix decrement operation. The result of the operation is the value of the operand "before" it has been decremented.
Remarks
Numeric and enumeration types have predefined decrement operators.
User-defined types can overload the -- operator (see operator). Operations on integral types are generally allowed on enumeration.
Example
// cs_operator_decrement.cs
using System;
class MainClass
{
static void Main()
{
double x;
x = 1.5;
Console.WriteLine(--x);
x = 1.5;
Console.WriteLine(x--);
Console.WriteLine(x);
}
}
Output
0.5 1.5 0.5