How to convert float or double to string

Question

i have a variable such this

double a=123456789012345678901234567890.1234567890123456;

i want to convert a(above variable) to string value in

console.writeline();

when i write

a.ToString(); 

i see the result as

1.23456789012346E+29

but only i want to have a varable such below.

string s="123456789012345678901234567890.1234567890123456";

how can i make s from a?

Answer 1

You can't, since double doesn't have such a high precision you can save the entire number into the double. (To see what part is actually saved, try Console.WriteLine(a.ToString("n9"));)

You have to use another data type that does support such high precision numbers, for example BigDecimal.