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Round Up A Number to the Greatest 10s Place

, 24 Jul 2014 CPOL
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How to round up a number to the greatest 10s place

Recently, we faced a situation in which we need to round up a number to the greatest 10s place.

For example: we needed to round up a number as follows:

  • 1023     -> 2000
  • 37911   -> 40000
  • 912345 -> 1000000

First, we checked Math.Round(). But it didn’t solve our problem. Math.Round() supports only rounding a value to the nearest integer or to the specified number of fractional digits. On further checking, we come up with a solution by using Math.Ceiling() method.

Math.Ceiling() returns the smallest integral value that is greater than or equal to the specified double-precision floating-point number.

For example:

  • Math.Ceiling(7.3)   -> 8
  • Math.Ceiling(7.64) -> 8
  • Math.Ceiling(0.12) -> 1

Below is the solution we came up with:

decimal[] values = { 1023, 37911, 23000, 1234, 912345 };
foreach (var value in values) {
//// get the length of the 10s places;
var length = value.ToString().Length - 1;
//// using Math.Pow() calculate the power of 10s
var power = Math.Pow(10, (double)length);
//// var roundadValue = Math.Ceiling(1023 / 1000) * 1000;
var roundadValue = Math.Ceiling(value / (decimal)power) * (decimal)power;

Console.WriteLine("Value:{0} Rounded Value:{1}", value, roundadValue); 
}

Math.Ceiling() Results

The Logic

Math.Ceiling(value / (decimal)power) * (decimal)power;
var roundadValue = Math.Ceiling(1023 / 1000) * 1000;

So, for any number, first calculate the power of 10s and then use it for the above calculation to get the results.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Tharaka MTR
Technical Lead Eyepax IT Consulting (Pvt) Ltd.
Sri Lanka Sri Lanka
Having more than 9 year hands-on industry experience in software development
Responsible for designing, implementing and managing complex software systems with stringent up-time requirement.

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Comments and Discussions

 
QuestionSituation NOT Citation Pin
deebee++23-Jul-14 4:27
professionaldeebee++23-Jul-14 4:27 
AnswerRe: Situation NOT Citation Pin
Tharaka MTR23-Jul-14 22:53
professionalTharaka MTR23-Jul-14 22:53 
SuggestionNice solution, but Pin
sashadu22-Jul-14 4:18
membersashadu22-Jul-14 4:18 
GeneralRe: Nice solution, but Pin
Tharaka MTR22-Jul-14 7:02
professionalTharaka MTR22-Jul-14 7:02 
GeneralRe: Nice solution, but Pin
George Swan22-Jul-14 11:41
memberGeorge Swan22-Jul-14 11:41 
GeneralRe: Nice solution, but Pin
Tomas Ruksenas18-Aug-14 4:57
memberTomas Ruksenas18-Aug-14 4:57 

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