C# use of unassigned local variable inside an if loop

Question

since I'm a bloody beginner, I'll need some help here:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Gauss_Algorithmus
{
    class Program
    {
        static void Main(string[] args)
        {
            if (x1 > 0 && x2 > 0)
            {
                 x02 = (x2 * x1) - (x1 * x2); 
                 y02 = (y2 * x1) - (x1 * y2);
                 z02 = (z2 * x1) - (x1 * z2);
                 d02 = (d2 * x1) - (x1 * d2);
            }
            Console.WriteLine("2.:   " + x02 + "x + " + y02 + "y + " + z02 + "  d02);
       }
   }

It says:

Use of unassigned local variable "x01, etc....

I understand the error and know that x01 is just defined in a local scope, but don't know how to fix it since x01, etc. needs to be defined inside the if loop.

I hope you can help me out guys, thanks in advance..

Those variables are never defined, so kinda hard to discuss; the definition position is critical here (as is the exact position where things are assigned values). Can you edit it to show a version that at least shows the same error as the one you are reporting? — Marc Gravell
– Marc Gravell, Commented Jun 14, 2016 at 10:28
And you never use x01 either, which means this isn't the code producing this error. Please provide a minimal reproducible example. — Jon Skeet
– Jon Skeet, Commented Jun 14, 2016 at 10:30
you are also missing a } that would close the scope of the namespace function — Mong Zhu
– Mong Zhu, Commented Jun 14, 2016 at 10:38

René Vogt · Accepted Answer · 2016-06-14 10:38:53Z

1

The best advise is to do a getting started with C# tutorial.

Specifically answering your question there are two things wrong:

You need to declare the variables. Basically using var x02 = (x2 * x1) - (x1 * x2); etc
The usage of the variables needs to be in the same scope. Either you have to move the Console.WriteLine inside the if block or you need to declare and initialize the variables before the if block like this: var x02 = 0; etc

edited Jun 14, 2016 at 10:38

René Vogt

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answered Jun 14, 2016 at 10:30

mnwsmit

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Komraid · Accepted Answer · 2016-06-15 08:28:31Z

0

As suggested earlier, see a good C# tutorial for beginners.

To make your example code work, do the following:

Declare variables first, maybe of integer types, e.g

int x1, x2, y1, y2, z1, z2, d1, d2, x02, y02, z02, d02;

Initialize them before using, e.g x1 = *value*; y1 = *value* ...

Reformat the Console.WriteLine statement, e.g: Console.WriteLine("2.: {0}", x02); //for displaying value of x02

edited Jun 15, 2016 at 8:28

answered Jun 14, 2016 at 10:49

Komraid

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