C # Converting String to double precision loss

Question

I have the following:

string value = "9223372036854775807"; double parsedVal = double.Parse(value, CultureInfo.InvariantCulture); 

... and the result is 9.2233720368547758E+18 , which is not exactly the same number. How to convert string to double without loss of precision?

Answer 1

You cannot convert 9223372036854775807 to double without loss of precision due to the definition of double (( IEEE 754 ) for binary floating-point arithmetic).

By default, a double value contains 15 decimal digits of precision, although a maximum of 17 digits is supported domestically.

Answer 2

double can only guarantee 16 (approximate) decimal digits of precision. You can try switching to decimal (which has a few more bits for the game, and holds this value with a large margin).

Answer 3

Using Decimal, you get the exact data you need. However, note that Decimal will not have the same storage size. like a double.

See Can C # store more accurate data than paired ones?