floating-point-precision

Printf width specifier to maintain precision of floating-point value

I recommend @Jens Gustedt hexadecimal solution: use %a. OP wants “print with maximum precision (or at least to the most significant decimal)”. A simple example would be to print one seventh as in: But let’s dig deeper … Mathematically, the answer is “0.142857 142857 142857 …”, but we are using finite precision floating point numbers. … Read more

Does parseDouble exist in JavaScript?

It’s not possible to natively deal with a 21-digit precision number in JavaScript. JavaScript only has one kind of number: “number”, which is a IEEE-754 Double Precision (“double”) value. As such, parseFloat in JavaScript is the equivalent of a “parse double” in other languages. However, a number/”double” only provides 16 significant digits (decimal) of precision and so reading in a number with 21-digits will lose the 5 … Read more