Left-pad a floating point number without losing trailing zeros after decimal point

Question

I am attempting to write out to a fixed format text file and am having some trouble formatting the numbers properly. It needs to be padded with leading zeros and an implied decimal.

Example:

43.80

The output would need to be:

0000004380

So far, I have attempted to convert the double to a string, replace the decimal, and then pad with "0".

((amount.ToString()).Replace(".","")).PadLeft(10, '0')

The problem with this is when the number ends with zeros. The above example comes out as:

0000000438

Any suggestions?

`Decimal.Truncate(amount * 100m).ToString("0").PadLeft(10, '0')` would do it, I think. — Glorin Oakenfoot, Jul 19 '16 at 22:04
Possible duplicate of [C# Padding Amount With Zeros](http://stackoverflow.com/questions/9587819/c-sharp-padding-amount-with-zeros) — Petter Friberg, Jul 26 '16 at 19:56

score 1 · Accepted Answer · answered Jul 19 '16 at 22:04

1

decimal value = 34.80M;
int intVal = (int)(value * 100);
return intVal.ToString("0000000000");

answered Jul 19 '16 at 22:04

Jon

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score 0 · Answer 2 · answered Jul 19 '16 at 22:05

0

You could try:

((string.Format("{0:0.00}", amount)).Replace(".","")).PadLeft(10, '0')

That way you don't lose the 2nd decimal place when the value is 0.

answered Jul 19 '16 at 22:05

CDurand

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score 0 · Answer 3 · answered Jul 19 '16 at 22:06

You can pass a .ToString() format string in as described in this article: https://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.110).aspx

Does the incoming value always have two decimal places? If so, you could multiply by 100 to get rid of the decimal, and then to .ToString("D10")

(Int)(43.80 * 100).ToString("D10")

score 0 · Answer 4 · answered Jul 19 '16 at 22:07

0

This should do the job : $"{(int)(amount * 100):D010}"

answered Jul 19 '16 at 22:07

Xiaoy312

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Left-pad a floating point number without losing trailing zeros after decimal point

4 Answers4