operator * cannot be applied to decimal and double c#

c# tax
Getwrong picture Getwrong · Dec 3, 2017 · Viewed 9.8k times · Source

I am currently making a tax program (study project) that read in a CSV file and generates a list of people and account balances, i need to round down 2 decimal places from one text box and add them up in another text box. my code attached tell me i cannot use " * " how do i times a decimal with 0.1? and if i am doing this wrong let me know, cheers!

public partial class Form1 : Form
{
    //CSV ARRAY LISTS
    List<string> fullName = new List<string>();
    List<string> accBalance = new List<string>();

    int currentItem;
    int index;
    int counter = 0;

    decimal interestBalance = 0;
    decimal result;

    decimal interestRemainder = 0;
    double round = 0.1;


 private void interestBalanceBox_TextChanged(object sender, EventArgs e)
    {
        interestRemainder = decimal.Parse(interestBalanceBox.Text);
        interestRemainder = Math.Truncate(0.1 * interestRemainder) / 100;
        interestRemainderBox.Text = interestRemainder.ToString();

    }

the program we are meant to represent is this one here! any help would be much appreciated.

enter image description here

Answer

Chris Carr picture Chris Carr · Dec 3, 2017 
interestRemainder = Math.Truncate((decimal)0.1 * interestRemainder) / 100;

You need to cast the 0.1 to the same type as the other operand

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