Normally, when converting a floating point value to a string, you can lose some precision. If you then later need to convert from the string back to the original floating point data type, you could end up with a different value. In the example below, we convert from a double to a string and then back again. But the double that we get in the end is not equal to the original value.
1 2 3 4 | double d1 = 0.123456789123456789;string s1 = d1.ToString();double d1b = <span class="skimlinks-unlinked">double.Parse(s1</span>);bool b1 = (d1 == d1b); |
You can use the “R” format specifier when converting to a string to indicate that you want to be able to convert back to a floating point value without loss of precision.
1 2 3 4 | double d1 = 0.123456789123456789;string s1 = d1.ToString("R");double d1b = <span class="skimlinks-unlinked">double.Parse(s1</span>);bool b1 = (d1 == d1b); |
