CODEWITHSUNDEEP
c#doubledecimalexponential
Carlos Martel Lamas
Carlos Martel Lamas

Reputation: 172

Turn number in exponential form to decimal

I am trying to convert a number in exponential form to its decimal equivalent. For example:

3e43 => 3 000 000 000 000 000 000 000 000 000 000 000 000 000 000 0

I've read the docs and it says that I may do this with double.Parse(expNumber.ToString(), NumberStyles.AllowExponent | NumberStyles.AllowDecimalPoint);

But when I try to convert 3e43 to decimal it just converts it to 3E+43 and not to the number I am expecting (I know it's about the double datatype precision). Is there a way to do that?

Also, is there any way to convert 3e-43 to its decimal equivalent? It seems that decimal.toString doesn't work this time as it is such an small number.

Upvotes: 0

Views: 305

Answers (1)

TheGeneral
TheGeneral

Reputation: 81473

If you want to see all the zeros

just use Double.ToString it has various overloads to do different things 

var input = "3e43";
var val = double.Parse(input, NumberStyles.AllowExponent | NumberStyles.AllowDecimalPoint);
Console.WriteLine(val);
Console.WriteLine(val.ToString("N0"));
Console.WriteLine(val.ToString("f"));

Output

3E+43
30,000,000,000,000,000,000,000,000,000,000,000,000,000,000
30000000000000000000000000000000000000000000.00

Full demo here

Additional resouces

Standard Numeric Format Strings

Upvotes: 1

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