CODEWITHSUNDEEP
c#
telepathiq
telepathiq

Reputation: 1

Calculating the circumference with C# Windows Forms App

For school, I have to create a calculator where you enter the radius of a circle and it calculates the circumference and the area.

I tried coding it and everything I tried just won't work. It kept giving me errors along the lines of it having difficulty converting the textbox into a double, and other errors. This is my code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Circumference
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnCalculate_Click(object sender, EventArgs e)
        {

            txtCircumference = Math.PI * Math.Pow(txtRadius, 2);
            txtArea = 2 * Math.PI * txtRadius;


        }
    }
}

I'm used to coding with python so C# is kinda out of my comfort zone.

Upvotes: 0

Views: 709

Answers (1)

Rick Davin
Rick Davin

Reputation: 1041

You may be new to C# but the most glaring issue is with WinForm controls. My answer assumes that txtRadius, txtCircumference, and txtArea are all TextBox controls.

Note I am writing this freeform and not in a VS editor so I may have errors.

private void btnCalculate_Click(object sender, EventArgs e)
{
    if (!double.TryParse(txtRadius.Text, out double radius))
    {
        throw new Exception("Radius is a not a valid double.");
    }
    txtCircumference.Text = (Math.PI * radius * radius).ToString();
    txtArea.Text = (2.0 * Math.PI * radius).ToString();
}

Observe that each TextBox has a .Text string property. For me to interchange a double with a string requires me to parse the string into a double, or else use ToString() to write the double as a string.

Upvotes: 2

Related Questions