How to use C# Double Variables

How to use C# Double Variable ???

• C# double variable can store 64 bit value in it.
• C# double can store integer as well as decimal values means you can save decimal values like 5.2, 3.1 as well as simple integers like 2, 5, 38 etc.
• C# double variable approximate value is ±5.0 × 10^-324 to ±1.7 × 10^308 as per Microsoft Official Page and its precision is 15-16 digits.
• So, first of all, design a new simple C# project as we did in Introduction to C# Windows Forms.
• I am not gonna design a new one, instead I am gonna use the same project as I did for C# Int Variable.
• So after creating a new project, add a Button and a Text Box in it as we did in How to add C# Controls in Windows form.
• Now, I hope that you are done with the front end of your C# Project and it will look something as shown in below figure:

• Now, let's add the code behind this form, so your code will look something as shown in below figure:

• Now if you have a look at it then you will see that its exactly the same code as we did for C# Int variables.
• But there's a slight difference that now all of the three variables a, b and c are double instead of int.
• That's why I have assigned decimal values to them where a = 2.5 while b = 2.6.
• C# Int variable can't use these value because these are not integers but double can easily handle them.
• So, now their result should be 5.1 which is again a double so that's why our third variable is also double.
• Here's the code for you to copy:

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

namespace Variables
{
    public partial class Form1 : Form
    {
        double a = 2.5;
        double b = 2.6;
        double c;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void ClickHere_Click(object sender, EventArgs e)
        {
            c = a + b;
            txtClick.Text = c.ToString();
        }
    }
}

• So, now run your project and then click the button and you will get results as shown in below figure:

• So, now you can see the value saved in C# double variable c was 5.1 which is now displayed in the Text Box.