problem in getting the decimal part of a double number in java

shiniskumar

Ive got a double number.

double n=47758.35;
Inorder to get the decimal part of this number i did as follows

long decPart = (long) ((n-Math.floor(n))*100);

in most cases i get the correct decimal part but in this case the decPart becomes"34" instead of "35"

how can i get the exact decimal part

Please Help

r035198x

Quote:

Originally Posted by shiniskumar

Ive got a double number.

double n=47758.35;
Inorder to get the decimal part of this number i did as follows

long decPart = (long) ((n-Math.floor(n))*100);

in most cases i get the correct decimal part but in this case the decPart becomes"34" instead of "35"

how can i get the exact decimal part

Please Help

You can split it up as string

Expand|Select|Wrap|Line Numbers

  String s = ""+n; 

String[] nums = s.split(".");

Now the decimal part is

Expand|Select|Wrap|Line Numbers

int decimal = Integer.parseInt(nums[1]);

shiniskumar

Quote:

Originally Posted by r035198x

You can split it up as string

Expand|Select|Wrap|Line Numbers

  String s = ""+n; 

String[] nums = s.split(".");

Now the decimal part is

Expand|Select|Wrap|Line Numbers

int decimal = Integer.parseInt(nums[1]);

Im gettinf nums as empty string after spilting
ie if n=2345.65 then s="2345.65"
but nums becomes []
so cant take nums[1]......
exception arrayindexoutofbound

r035198x

Quote:

Originally Posted by shiniskumar

Im gettinf nums as empty string after spilting
ie if n=2345.65 then s="2345.65"
but nums becomes []
so cant take nums[1]......
exception arrayindexoutofbound

Use

Expand|Select|Wrap|Line Numbers

String[] nums = s.split("\\.");

shiniskumar

Quote:

Originally Posted by r035198x

Use

Expand|Select|Wrap|Line Numbers

String[] nums = s.split("\\.");

Thanks, its working

Can u tell me the difference between those two types of split.

r035198x

Quote:

Originally Posted by shiniskumar

Thanks, its working

Can u tell me the difference between those two types of split.

The . is a special character so you have to use \\ to match it in the regular expression.

chrome8

Have you considered what happens for large double values?

For example:

double aNum = 444444444.56
System.out.println("my number is: " + aNum);

the result is:

4.4444444456E8

You can get around this with the DecimalFromat class with a tradeoff in performance.

r035198x

Quote:

Originally Posted by r035198x

You can split it up as string

Expand|Select|Wrap|Line Numbers

  String s = ""+n; 

String[] nums = s.split(".");

Now the decimal part is

Expand|Select|Wrap|Line Numbers

int decimal = Integer.parseInt(nums[1]);

Ha, priceless.

chrome8

Quote:

Originally Posted by r035198x

Ha, priceless.

If 'n' is a large double it will be converted to scientific notation when printed as a string.

jkmyoung

It may be a rounding error due to returning a double. You could also try using round.

long decPart = Math.round((n-Math.floor(n))*100);

CodeWeaver

String decimal=txtAmount.getText();
int a = decimal.indexOf(".");
decimal=decimal.substring(a);

CodeWeaver

Quote:

Originally Posted by shiniskumar

Ive got a double number.

double n=47758.35;
Inorder to get the decimal part of this number i did as follows

long decPart = (long) ((n-Math.floor(n))*100);

in most cases i get the correct decimal part but in this case the decPart becomes"34" instead of "35"

how can i get the exact decimal part

Please Help

As you mentioned it has problem when asked for 35 it gives 34 sort off

and also the splitting method gives problem like if we have 3.04 so the output will be 4 and if its 3.40 even now the output will be 4
the method i mentioned above gives correct output like 04 or 40

problem in getting the decimal part of a double number in java

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re: problem in getting the decimal part of a double number in java

re: problem in getting the decimal part of a double number in java

re: problem in getting the decimal part of a double number in java

re: problem in getting the decimal part of a double number in java

re: problem in getting the decimal part of a double number in java

re: problem in getting the decimal part of a double number in java

re: problem in getting the decimal part of a double number in java

re: problem in getting the decimal part of a double number in java

re: problem in getting the decimal part of a double number in java

re: problem in getting the decimal part of a double number in java

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