C# Return statement with auto-increment value

Question

Is there a reason why these 2 examples do not produce the same value. C # doesn't seem to auto-increment before returning.

        nextNumber++;
        return nextNumber;

and

 return nextNumber++;

Is it a bug? I am using Microsoft Visual Studio Community 2019 Version 16.7.6

Answer 1

Nope, check this out:

using System;
                    
public class Program
{
    public static void Main()
    {
        Console.WriteLine(t1(1));
        Console.WriteLine(t2(1));
        Console.WriteLine(t3(1));
    }
    
    private static int  t1(int nextNumber)
    {
         return nextNumber++;       
    }
    
    private static int  t2(int nextNumber)
    {
        nextNumber++;
        return nextNumber;  
    }
    
    private static int t3(int nextNumber)
    {
        return ++nextNumber;    
    }
}

https://dotnetfiddle.net/4fna9w

outputs:

1
2
2

See: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/arithmetic-operators#increment-operator-

the postfix increment operator, x++, and the prefix increment operator, ++x.

Check the examples on the doc.