Why can't I run this code on this app?

Question

using Sytem;
namespace Learning_Variables
{
class Program
{
static void Main(string[] args)
{
double num01;
double num02;
double num03;

Console.Write("Input a number: ");
Convert.ToDouble( Console.ReadLine() );

Console.Write("Input a second number");
Convert.ToDouble( Console.ReadLine() );

Console.Write("Input a third number");
Convert.ToDouble( Console.ReadLine() );

double xyz = num01 + num02 + num03;
double result = (xyz / 3);
Console.WriteLine("The average of these numbers is " + result );

Console.ReadKey();

}
}
}

Answer 1

Do this code run on other IDEs?
Only a question, because you don't have assigned the variables num01... num03

Like this:

num01 = Convert.ToDouble( Console.ReadLine() );

The " num01 =" part is missing for all three variables.

Answer 2

And write

using System;

Instead of;

using Sytem;

Answer 3

Thank you! 🙏