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Increment and decrement

Handbook C# · Practical Guide

Prefix returns a new value; the postfix returns the previous one. Both forms modify the variable.

Simple example (Example.cs)

Save this example separately as Example.cs. Run it independently of the other examples on this page.

Example.cs:

// PROJECT-EXAMPLE
int count = 2;
System.Console.WriteLine(count++);
System.Console.WriteLine(++count);

Result:

2
4

Syntax

++value / value++ / --value / value--

Example 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        int value = 2;
        Console.WriteLine(value++); Console.WriteLine(++value);
        Console.WriteLine(value--); Console.WriteLine(--value);
    }
}

Example 2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        int[] values = [10, 20, 30];
        int index = 0;
        while (index < values.Length) Console.WriteLine(values[index++]);
    }
}

Official source: Microsoft Learn.