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possible loss of precision

 
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possible loss of precision
jblesko
19 Feb, 2008 - 11:39 AM
Post #1

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CODE
import javax.swing.JOptionPane;

public class NO1HW4 {
    
    public static void main(String[] args) {
        
        String firstNumber;
        int number1;
        int total;
        int GrandTotal;
                
        GrandTotal = 0;
        number1 = 0;
        total = 0;
                       
    while ( number1 != -1 )
    {
    
            firstNumber = JOptionPane.showInputDialog( "Enter Cost of Sale or -1 to End:" );
            
            number1 = Integer.parseInt( firstNumber );
            total = total + number1;
    }    
        
        GrandTotal = total * 0.09;
        GrandTotal = GrandTotal + 200;
            
        JOptionPane.showMessageDialog( null, "Weekly earnings = $" + GrandTotal,
         "Results", JOptionPane.PLAIN_MESSAGE );
        
        
    }
}
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AbuJaFaR
RE: Possible Loss Of Precision
19 Feb, 2008 - 01:01 PM
Post #2

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Hello there,
Please edit your post and put your code inside
the code brackets.Thnx.
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letthecolorsrumble
RE: Possible Loss Of Precision
19 Feb, 2008 - 02:45 PM
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The variable GrandTotal needs to be a double or a float in order to calculate GT = total *0.09
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Jayman
RE: Possible Loss Of Precision
19 Feb, 2008 - 02:47 PM
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You are getting the "loss of precision" because you have declared GrandTotal as an integer type. But you are trying to store the value of a double in this line of code, GrandTotal = total * 0.09;. Integer data types don't have decimal values, therefore you will lose some of the value when multiplying 0.09 * total.

Change the data type to a double.
CODE

double GrandTotal;
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bhandari
RE: Possible Loss Of Precision
20 Feb, 2008 - 12:28 AM
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QUOTE
Change the data type to a double.
CODE
double GrandTotal;


or make an explicit cast as
CODE
GrandTotal = (int) (total * 0.09);
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