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int ans;
Console.Write("2+3+1= ");
ans=Convert.ToInt32(Console.ReadLine());
if(ans==6) {
Console.WriteLine("Correct");
}else{
Console.WriteLine("wrong");
}
Problems:
A local variable or function named 'ans' is already defined in this scope
Use of unassigned local variable 'ans'

What I have tried:

i removed all the text and wrote them again didnt work.
Posted
Updated 21-May-21 5:31am

1 solution

That isn't all your code: that code on it's own generates no errors, and runs, doing what you expected it to:
C#
using System;
using System.Collections.Generic;
using System.IO;

public class Program
    {
    public static void Main()
        {
        int ans;
        Console.Write("2+3+1= ");
        ans=Convert.ToInt32(Console.ReadLine());
        if(ans==6) 
            {
            Console.WriteLine("Correct");
            }
        else
            {
            Console.WriteLine("wrong");
            }
        }
    }
Somewhere else in the same scope in your code, you are declaring something called "ans" - a variable, constant, or even a method!

And don't use Convert methods on user input - they will cause you app to crash if the user enters a non-numeric character. Use the TryParse methods instead: Int32.TryParse Method (System) | Microsoft Docs[^]. They return a bool "OK / Failed" result so you can give them another chane.
   
Comments
Suleman Malik 21-May-21 11:41am
   
thank you
OriginalGriff 21-May-21 12:02pm
   
You're welcome!

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