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Casting from double to int leading to in correct data for very specific numbers

H Und
Greenhorn

Joined: Mar 25, 2010
Posts: 7
We just came across the following thing, which is very interesting and misleading the other program by its outcome. Could you please tell me, what is wrong with the following little program.


public class CastingClass {

static double x = 269.28;
public static void printValue(){
System.out.println("Original Value: " + x);
System.out.println("Before Casting; " + x * 100);
int i = (int) (x * 100);
System.out.println("After Casting: " + i);
}
static public void main(String[] args){
printValue();
}
}



// I am getting the following result, which is not correct.

-------------------------------------------------
Original Value: 269.28
Before Casting, but multiplying with 100: 26927.999999999996
After Casting: 26927

---------------------------------------------------------
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 19059
    
  40

H Und wrote:We just came across the following thing, which is very interesting and misleading the other program by its outcome. Could you please tell me, what is wrong with the following little program.


public class CastingClass {

static double x = 269.28;
public static void printValue(){
System.out.println("Original Value: " + x);
System.out.println("Before Casting; " + x * 100);
int i = (int) (x * 100);
System.out.println("After Casting: " + i);
}
static public void main(String[] args){
printValue();
}
}



// I am getting the following result, which is not correct.

-------------------------------------------------
Original Value: 269.28
Before Casting, but multiplying with 100: 26927.999999999996
After Casting: 26927

---------------------------------------------------------



Take a look at point #20 here... http://www.coderanch.com/how-to/java/JavaBeginnersFaq


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