How to get dynamic maximum value of integer based on the number of decimal places

Question

I have a dynamic data of 0001, since it is dynamic it can change based on the data given. it could be 01 or 001 or 0001. to derive this value i have a code of

            var placeholderValue = 4; //number can be dynamic. 
            var intFormattedValue = String.Format($"{{0:D{palceholderValue}}}", 1);
            var parasedValue =  Int32.Parse(intFormattedValue); //output 0001

if the placeholderValue above is 4, the output would be 0001 if it is 3 then 001 then if 2 01.

What i want to get is if the value is 0001 then it would return 9999 if the value is 001 then 999 if 01 then 99.

Answer 1

You can try to use Math.Pow method for 10 power and some calculation get the maximum value

Math.Pow(10, placeholderValue) - 1