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How to Create a Calculator App in C#.NET in a easy way[with source code]

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code:

import library:

using System.Data;

inside the form class:

private string currentCalculation = "";

create following function:

1. for button text extraction

private void button_click(object sender, EventArgs e)
{
currentCalculation += (sender as Button).Text;
txtOutput.Text = currentCalculation;
}

2. for calculation


private void button_Equals_click(object sender, EventArgs e)
{
string formattedCalculation = currentCalculation.ToString();
try
{

txtOutput.Text = new DataTable().Compute(formattedCalculation, null).ToString();
currentCalculation = txtOutput.Text;

}
catch(Exception ex)
{
txtOutput.Text = "ERROR";
currentCalculation = "";
}
}

 

3. for clearing button


private void button_Clear_click(object sender, EventArgs e)
{
txtOutput.Text = "0";
currentCalculation = "";
}

4. for clearing entry button


private void button_clearEntery_click(object sender, EventArgs e)
{
if (currentCalculation.Length > 0)
{
//1+1
currentCalculation = currentCalculation.Remove(currentCalculation.Length - 1, 1);

}
txtOutput.Text = currentCalculation;
}

 

call these function in respective button clicking event!

more:

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