Double vs. BigDecimal?
I have to calculate some floating point variables and my colleague suggest me to use BigDecimal instead of double since it will be more precise. But I want to know what it is and how to make most out of BigDecimal? 6 Answers 6
floating-point
How to convert float to int with Java
I used the following line to convert float to int, but it’s not as accurate as I’d like: float a=8.61f; int b; b=(int)a; The result is : 8 (It should be 9) When a = -7.65f, the result is : -7 (It should be -8) What’s the best way to do it ? 9 Answers … Read more
How do I print a double value with full precision using cout?
In my earlier question I was printing a double using cout that got rounded when I wasn’t expecting it. How can I make cout print a double using full precision? 16 Answers 16
How dangerous is it to compare floating point values?
I know UIKit uses CGFloat because of the resolution independent coordinate system. But every time I want to check if for example frame.origin.x is 0 it makes me feel sick: if (theView.frame.origin.x == 0) { // do important operation } Isn’t CGFloat vulnerable to false positives when comparing with ==, <=, >=, <, >? It … Read more
JavaScript displaying a float to 2 decimal places
I wanted to display a number to 2 decimal places. I thought I could use toPrecision(2) in JavaScript . However, if the number is 0.05, I get 0.0500. I’d rather it stay the same. See it on JSbin. What is the best way to do this? I can think of coding a few solutions, but … Read more
What is the best way to compare floats for almost-equality in Python?
It’s well known that comparing floats for equality is a little fiddly due to rounding and precision issues. For example: https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/ What is the recommended way to deal with this in Python? Surely there is a standard library function for this somewhere? 17 Answers 17
How to format a float in javascript?
In JavaScript, when converting from a float to a string, how can I get just 2 digits after the decimal point? For example, 0.34 instead of 0.3445434. 14 Answers 14 There are functions to round numbers. For example: var x = 5.0364342423; print(x.toFixed(2)); will print 5.04. EDIT: Fiddle
How to parse float with two decimal places in javascript?
I have the following code. I would like to have it such that if price_result equals an integer, let’s say 10, then I would like to add two decimal places. So 10 would be 10.00. Or if it equals 10.6 would be 10.60. Not sure how to do this. price_result = parseFloat(test_var.split(‘$’)[1].slice(0,-1)); 17 s 17 … Read more
What is the difference between float and double?
I’ve read about the difference between double precision and single precision. However, in most cases, float and double seem to be interchangeable, i.e. using one or the other does not seem to affect the results. Is this really the case? When are floats and doubles interchangeable? What are the differences between them? 14 s 14 … Read more
Correct format specifier for double in printf
What is the correct format specifier for double in printf? Is it %f or is it %lf? I believe it’s %f, but I am not sure. Code sample #include <stdio.h> int main() { double d = 1.4; printf(“%lf”, d); // Is this wrong? } 5 s 5 “%f” is the (or at least one) correct … Read more