Multiples of 10,100,1000,... C#

Question

I want an integer to be multiples of 10,100,1000 and so on...

For eg double val = 35 then I want int 40
val = 357 then I want int val = 400
val = 245,567 then I want int val = 300,000
val = 245,567.986 then also I want int = 300,000

Is there anything in C# that can help in generating these integer

Basic logic that I can think is : Extract the first integer , add 1 to it. Count the total number of digits and add zeros (totalno -1 ).

Is there any better way ?

I want to assign these values to the chart axis. I am trying to dynamically create the axis label values based on datapoints of the charts.

Answer 1

This should do what you want where x is the input:

        double scale = Math.Pow(10, (int)Math.Log10(x));
        int val = (int)(Math.Ceiling(x / scale) * scale);

Output:

 35          40
 357         400
 245567      300000
 245567.986  300000

If you want it to cope with negative numbers (assuming you want to round away from 0):

        double scale = (x == 0 ? 1.0 : Math.Pow(10, (int)Math.Log10(Math.Abs(x))));
        int val = (int)(Math.Ceiling(Math.Abs(x) / scale) * scale)*  Math.Sign(x);

Which gives:

-35         -40
 0           0
 35          40
 357         400
 245567      300000
 245567.986  300000