round up to nearest number and significant figures

[Steve]

1. Is there a way to convert a variable .09999999 to .1?

2. Likewise how can I convert 108229.99 to 108230.0 (it must alway be
rounded up and be an integer)

Thanks

 

[Thomas Schodt]

1. Is there a way to convert a variable .09999999 to .1?

For a given precision .09999999 is equal to .1
A floating point value is not stored like that.

IIRC Roedy posted a link to an explanation of floating point only a few
threads up.

Maybe you want BigDecimal?
Read what Roedy has to say.

2. Likewise how can I convert 108229.99 to 108230.0 (it must alway be
rounded up and be an integer)

double foo = 108229.99;
int bar = (int)(foo+.5);

 

[Fred]

Use the DecimalFormat class - for example here is a snippet...

import java.text.*;

class test
{
public static void main(String Args[])
{


DecimalFormat fmtObj = new DecimalFormat("####0.00");

double d1 = 1.0199999;

System.out.println(d1);
System.out.println(fmtObj.format(d1));
}

}


Here are the results from running this class file:

1.0199999
1.02
Press any key to continue...


Hope this helps you,

Fred.

 

[Roedy Green]

1. Is there a way to convert a variable .09999999 to .1?

2. Likewise how can I convert 108229.99 to 108230.0 (it must alway be
rounded up and be an integer)

see http://mindprod.com/jgloss/floatingpoint.html

 

[Steve]

Thank you, I read your web page.

I am just a bit confused how to use this information. The Math funtionality
is not recognised and I have almost no experience in java.

I presently have
float MPoriginalFormat = (MP2+MDC)*1000; //110060, could show as 110059.99

// need to convert this to 110060

Use long Math. round ( double )

Thank you.

 

[Steve]

got it, thanks
MPoriginalFormat2= (int) Math.ceil(MPoriginalFormat); //it needs to be an
integer rounded up

Thank you, I read your web page.

I am just a bit confused how to use this information. The Math funtionality
is not recognised and I have almost no experience in java.

I presently have
float MPoriginalFormat = (MP2+MDC)*1000; //110060, could show as 110059.99

// need to convert this to 110060

Use long Math. round ( double )

Thank you.