I have a number with 15 digit after floating point and I need to extract 15th digit and use it. How a con do that in C#

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I write the program and need to work with last digit of output and display this digit in binary but I need to extract that last digit and then working with it . I do not know how I can do that.

What I have tried:

i try to write the code in c# for solve this problem

Posted 29-Sep-17 23:27pm

Malak Sajad Alhaidary

Updated 6-Oct-17 9:56am

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2 solutions

Solution 2

I find the best solution by convert the number to string then by using the sequence function extract the last character then convert it to integer. if a=0.1245378 then the integer become equal 8.

C#

string s = Convert.ToString(a);
string l = s.Substring(s.Length -1);
int integer = Convert.ToInt16(l);

Posted 6-Oct-17 9:56am

Malak Sajad Alhaidary

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OriginalGriff · Accepted Answer · 2017-09-29T23:38:00

That's not going to be easy - a double in C# only has 15~16 digit precision: double (C# Reference) | Microsoft Docs[^] so the normal "multiply and remove teh integer part is not goign to work. In fact, it quite likely that the "15th digit after the float point" is not stored at all - bear in mind that floating point numbers are representations of binary stored data, and are not necesssarily accurate.
One way to do it is a "brute force and ignorance" approach: convert it to a string, and get the digits from that.

But a better solution is to look at exactly what you get the number from, and see how it's generated - my guess would be that the input data isn't 15 digit accurate, so it's unlikely that the value you are playing with is really accurate at that precision.