CODEWITHSUNDEEP
c#
Balla13
Balla13

Reputation: 161

c# infinite Calculator that displays all digits

I'm trying to create a calculator where you have two text boxes for numeric inputs and the last one which displays the number. However, i want to make it such that it will go to at least 80 digits without scientific notation(decimals don't matter). Does anyone have any suggestions as to how I would implement this ?

Thank you. 

public void button1_Click(object sender, EventArgs e)
    {

        //Addition 
        **resultAdd = Convert.ToDouble(tb1.Text) ;**

        tb2.Enabled = true;
        calcFunc = "Add";


     }



    private void btnSubtract_Click(object sender, EventArgs e)
    {
        //subtract
        resultSubtract = Convert.ToDouble(tb1.Text) + 0;
        tb2.Enabled = true;
        calcFunc = "Subtract";
    }

    public void btnEqual_Click(object sender, EventArgs e)
    {

        double totalResult;


        switch (calcFunc)
        {
            case "Add":
                   totalResult = Convert.ToDouble(tb2.Text) + resultAdd;
                   total = tbTotal.Text.ToCharArray();
                   string x = Convert.ToString(totalResult);
                   tbTotal.Text = x;

                //   tbTotal.Text = x;
                   tbTotal.Enabled = true;

                   **totvalue = BigInteger.Parse(x);**

Upvotes: 1

Views: 1791

Answers (1)

Jon Skeet
Jon Skeet

Reputation: 1500575

If by "decimals don't matter" you mean you're only dealing with integers, and assuming your using .NET 4 or higher, then you should use System.Numerics.BigInteger which allows for arbitrarily large integers.

(You'll still need to do all the GUI work, but you can use BigInteger for all the calculations.)

Short but complete example to show that BigInteger is perfectly capable of handling large numbers:

using System;
using System.Numerics;

class Test
{
    static void Main()
    {
        string text = new string('1', 80);
        BigInteger number = BigInteger.Parse(text);
        Console.WriteLine(number);
    }
}

EDIT: Okay, now you've posted your code, it's obvious what's wrong - you're going via double for no reason in this code:

totalResult = Convert.ToDouble(tb2.Text) + resultAdd;
total = tbTotal.Text.ToCharArray();
string x = Convert.ToString(totalResult);
tbTotal.Text = x;
totvalue = BigInteger.Parse(x);

You're not trying to handle double values - you're trying to handle integers so do everything with BigInteger. Change resultAdd to a BigInteger too, and then all you need is:

BigInteger result = BigInteger.Parse(tb2.Text) + resultAdd;

No need to do any other string conversions.

Upvotes: 12

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