How To Create Calculator UWP App

Requirements: Visual Studio 2015 or higher version with Windows SDK.

Step 1: Open Visual Studio 2015 and afterwards, go to File and go to New. Now, go to project.

File→New→Project.



Step 2: We can choose Visual C# and select Windows. Afterwards, select the universal and next select the Blank App(Universal Windows).

Visual C#→Windows→universal→Blank App(Universal Windows).



Step 3: Choose the target and minimum platform versions, which your Universal Windows Application will support.



Step 4: Open Mainpage.XAML, add the codes given below:



The page is given below:



Step 5: Open Mainpage.cs file, add the code, given below:

namespace calculator12
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        string input = string.Empty;
        string x = string.Empty;
        string y = string.Empty;
        char operation;
        double result = 0.0;
        public MainPage()
        {
            this.InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            this.textBox.Text = " ";
            input += "1";
            this.textBox.Text += input;
        }

        private void button_Click(object sender, RoutedEventArgs e)
        {
            this.textBox.Text = " ";
            input += "2";
            this.textBox.Text += input;

        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            this.textBox.Text = " ";
            input += "3";
            this.textBox.Text += input;

        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            this.textBox.Text = " ";
            input += "4";
            this.textBox.Text += input;

        }

        private void button4_Click(object sender, RoutedEventArgs e)
        {
            this.textBox.Text = " ";
            input += "5";
            this.textBox.Text += input;

        }

        private void button5_Click(object sender, RoutedEventArgs e)
        {
            this.textBox.Text = " ";
            input += "6";
            this.textBox.Text += input;

        }

        private void button6_Click(object sender, RoutedEventArgs e)
        {
            this.textBox.Text = " ";
            input += "7";
            this.textBox.Text += input;

        }

        private void button7_Click(object sender, RoutedEventArgs e)
        {
            this.textBox.Text = " ";
            input += "8";
            this.textBox.Text += input;

        }

        private void button8_Click(object sender, RoutedEventArgs e)
        {
            this.textBox.Text = " ";
            input += "9";
            this.textBox.Text += input;

        }

        private void button9_Click(object sender, RoutedEventArgs e)
        {
            this.textBox.Text = " ";
            input += "0";
            this.textBox.Text += input;

        }

        private void button10_Click(object sender, RoutedEventArgs e)
        {
            x = input;
            operation = '+';
            input = string.Empty;
        }

        private void button11_Click(object sender, RoutedEventArgs e)
        {
            x = input;
            operation = '-';
            input = string.Empty;
        }

        private void button12_Click(object sender, RoutedEventArgs e)
        {
            x = input;
            operation = '*';
            input = string.Empty;
        }

        private void button13_Click(object sender, RoutedEventArgs e)
        {
            x = input;
            operation = '/';
            input = string.Empty;
        }

        private void button14_Click(object sender, RoutedEventArgs e)
        {

            this.textBox.Text = " ";
            input += ".";
            this.textBox.Text += input;
        }

        private void button16_Click(object sender, RoutedEventArgs e)
        {
            y = input;
            double num1, num2;

            double.TryParse(x, out num1);
            double.TryParse(y, out num2);

            if (operation == '+')
            {
                result = num1 + num2;
                textBox.Text = result.ToString();
            }
            else if (operation == '-')
            {
                result = num1 - num2;
                textBox.Text = result.ToString();
            }
            else if (operation == '*')
            {
                result = num1 * num2;
                textBox.Text = result.ToString();
            }
            else if (operation == '/')
            {
                if (num2 != 0)
                {
                    result = num1 / num2;
                    textBox.Text = result.ToString();
                }
                else
                {
                    textBox.Text = "DIV/Zero!";
                }

            }
        }

        private void button15_Click(object sender, RoutedEventArgs e)
        {
            textBox.Text = "0";
        }
    }
}

Step 6: You can run the project.



Step 7: You can see the output, given below: