I would like to format my numbers to always display 2 decimal places, rounding where applicable. Examples: number display —— ——- 1 1.00 1.341 1.34 1.345 1.35 I have been using this: parseFloat(num).toFixed(2); But it’s displaying 1 as 1, rather than 1.00. 36 s 36
I’ve always been told never to represent money with double or float types, and this time I pose the question to you: why? I’m sure there is a very good reason, I simply do not know what it is. 16 s 16 Because floats and doubles cannot accurately represent the base 10 multiples that we … Read more
Why does this bit of code, const float x[16] = { 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6}; const float z[16] = {1.123, 1.234, 1.345, 156.467, 1.578, 1.689, 1.790, 1.812, 1.923, 2.034, 2.145, 2.256, 2.367, 2.478, 2.589, 2.690}; float y[16]; for (int i = 0; i … Read more
I am doing some numerical optimization on a scientific application. One thing I noticed is that GCC will optimize the call pow(a,2) by compiling it into a*a, but the call pow(a,6) is not optimized and will actually call the library function pow, which greatly slows down the performance. (In contrast, Intel C++ Compiler, executable icc, … Read more
What is the difference between decimal, float and double in .NET? When would someone use one of these? 1 18 float and double are floating binary point types. In other words, they represent a number like this: 10001.10010110011 The binary number and the location of the binary point are both encoded within the value. decimal … Read more
Consider the following code: 0.1 + 0.2 == 0.3 -> false 0.1 + 0.2 -> 0.30000000000000004 Why do these inaccuracies happen? 3 31
What is the best possible way to check if a string can be represented as a number in Python? The function I currently have right now is: def is_number(s): try: float(s) return True except ValueError: return False Which, not only is ugly and slow, but also seems clunky. However, I haven’t found a better method … Read more
I want a to be rounded to 13.95. I tried using round: >>> a 13.949999999999999 >>> round(a, 2) 13.949999999999999 3 32 You are running into the old problem with floating point numbers that not all numbers can be represented exactly. The command line is just showing you the full floating point form from memory. With … Read more
How can I convert a str to float? “545.2222” → 545.2222 How can I convert a str to int? “31” → 31 30
How can I convert integer into float in Java?
