❔ Can not figure out a way to make my code repeat until you type a valid input

im having a hard time figuring out how to make my code repeat until you enter a number and if you enter a letter or some other character it will just repeat itself
im also kinda new to this so please dont butcher me

namespace CSLearning
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Enter your type of equation(+, -, *, /): ");
            string typeOfEquation = Console.ReadLine();
            if (typeOfEquation.Contains('+'))
            {
                double num1 = 0;
                double num2 = 0;
                Console.Write("Enter your first adden: ");
                string adden1 = Console.ReadLine();
                Console.Write("Enter your second adden: ");
                string adden2 = Console.ReadLine();
                num1 = Convert.ToDouble(adden1);
                num2 = Convert.ToDouble(adden2);
                Console.WriteLine("The awsnwer to your equation is " + num1 + num2);
            }

            Console.ReadLine();
        }

    }
}

Use a loop

A while loop, most commonly

And $tryparse to check if the entered value is actually a number. And if so, to get the parsed value out

The TryParse pattern is considered best practice of parsing data from a string:
- a TryParse method returns true or false to inform you if it succeeded or not, so you can use it directly in a condition,
- since C# 7 you can declare a variable that will be used as an out argument inline in an argument list,
- it forces you to check if the out argument contains valid data afterwards,

Avoid: Convert.ToInt32 — it's a bad choice for parsing an int. It exists only for backwards compatibility reasons and should be considered last resort.

return Convert.ToInt32(null); //returns 0. null should not be considered as 0 ever
return Convert.ToInt32("asdf"); //throws FormatException

(Note: Convert does contain useful conversion methods: To/FromBase64String, To/FromHexString, ToString(X value, int toBase), ToX(string? value, int fromBase))

Avoid: int.Parse — you have to use a try/catch statement to handle invalid input, which is a less clean solution.

var number = int.Parse("abc"); //throws FormatException
var number = int.Parse(""); //throws FormatException

Use int.TryParse https://docs.microsoft.com/en-us/dotnet/api/system.int32.tryparse?view=net-5.0#System_Int32_TryParse_System_String_System_Int32__

if (int.TryParse(someInput, out var result))
{
  Console.WriteLine($"Thanks for giving me the following number: {result}!");
}
else
{
  Console.WriteLine("You didn't give me a valid number :c");
}

how do I add the while loop in the code

Just... do

Write it

huh?

Adding a while loop is no different than adding any other piece of code

Just stroke the keys on your keyboard to input proper symbols that make up valid syntax

there's a learning module on while loops if you need it

while (adden1 != double)
is the only thing that comes to my mind and it doesnt work

I told you to use TryParse() since it returns a boolean

The bot even posted more explanation

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.