A customer purchases 1 kg of sweets at rs. 60 .find the quantity of sweets rs. 51?

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here i give 3 textboxes, quantity, amount and total price in 1 unit comboBox i want do when i enter in total amount textbox any amount like Rs. 51 then automatically calculate quantity in kg or grams,
i dont understand how to i do to calculate quantity acording to amount.

What I have tried:

C#

private void Totaltxt_KeyDown(object sender, KeyEventArgs e)
         {
             if (txttax.SelectedIndex > 0 && Totaltxt.Text != "" )
             {
                 double Quantity1 = Convert.ToDouble(txtqty.Text);
                 double Price1 = Convert.ToDouble(qtytxtprice.Text);
                 double Price2 = 0;
                 double Quantity2 = 1;
                 //float q;
                 try
                 {
                     Price2 = Convert.ToSingle(Totaltxt.Text);
                     Quantity2 = Convert.ToDouble((Quantity1 / Price1) * Price2);
                     txtqty.Text = Quantity2.ToString("F2");
                 }
                 catch { }
             }
         }

Posted 12-Dec-17 20:33pm

Deekshaa Singh Chauhan

Updated 13-Dec-17 21:20pm

CPallini

v3

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Comments

Richard Deeming 13-Dec-17 10:24am

Oh, come on! This isn't a code problem; it's a basic arithmetic problem.

Work out how you'd do it on paper, or using a calculator. Then do that in code.

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________________ · Answer 1 · 2017-12-12T20:45:00

Solution 1

double Quantity1 = 1.00;
double Price1 = 60.0;

double Price2 = 51.0;

double Quantity2 = (Quantity1 / Price1) * Price2;

Posted 12-Dec-17 20:45pm

________________

Updated 12-Dec-17 21:11pm

Comments

CPallini 13-Dec-17 3:18am

5.

________________ 13-Dec-17 4:09am

Just going according the rules! ;-)

Deekshaa Singh Chauhan 13-Dec-17 3:47am

i mean 60rs per kg ,then 51rs me koi buy karega to kya quantity hogi use kese calculate kare

________________ 13-Dec-17 4:05am

Only so it is correct:
60 rs for 1 kg.
1 kg per 60 rs.

This give proportion, and unknown quantity could be calculated, if one member (51rs) is known.
The result of your example is 850 gram.

________________ 13-Dec-17 4:08am

1/60== X/51.

X = 1/60 * 51

Deekshaa Singh Chauhan 14-Dec-17 1:59am

I did this but it is not giving the right result.

private void Totaltxt_KeyDown(object sender, KeyEventArgs e)
{
if (txttax.SelectedIndex > 0 && Totaltxt.Text != "" && Totaltxt.Text != null )
{
double Quantity1 = Convert.ToDouble(txtqty.Text);
double Price1 = Convert.ToDouble(qtytxtprice.Text);
double Price2 = 0;
double Quantity2;
//float q;
try
{
Price2 = Convert.ToDouble(Totaltxt.Text);
Quantity2 = Convert.ToDouble((Quantity1 / Price1) * Price2);
txtqty.Text = Quantity2.ToString("F2");
}
catch { }
}
}

________________ 14-Dec-17 2:36am

Check your inputs, Convert to double may trow exception,
or you are collecting data from textboxes incorrect....

double Quantity1 = Convert.ToDouble("1.00");
double Price1 = Convert.ToDouble("60.0");
double Price2 = 0;
double Quantity2;

try
{
Price2 = Convert.ToDouble("51.0");
Quantity2 = Quantity1 / Price1 * Price2;//Fixed *
txtqty.Text = Quantity2.ToString("F2");
}
catch(Exception ex)
{

}

*When you already works with double, there is no conversion needed.

Deekshaa Singh Chauhan 14-Dec-17 2:43am

double Quantity1 = texbox.text ;
there is throw error bcoz it take textbox.text as string

CPallini 14-Dec-17 3:19am

You cannot do that. Use Convert.ToDouble(texbox.Text) and handle possible exceptions.

________________ 14-Dec-17 3:24am

I fixed only one row!