I’ve been poring through .NET disassemblies and the GCC source code, but can’t seem to find anywhere the actual implementation of sin() and other math functions… they always seem to be referencing something else. Can anyone help me find them? I feel like it’s unlikely that ALL hardware that C will run on supports trig … Read more
For example: 9 / 5 #=> 1 but I expected 1.8. How can I get the correct decimal (non-integer) result? Why is it returning 1 at all? 7 Answers 7
I have the results of a division and I wish to discard the decimal portion of the resultant number. How can I do this? 15 Answers 15
There have been several questions posted to SO about floating-point representation. For example, the decimal number 0.1 doesn’t have an exact binary representation, so it’s dangerous to use the == operator to compare it to another floating-point number. I understand the principles behind floating-point representation. What I don’t understand is why, from a mathematical perspective, … Read more
Having a list of points, how do I find if they are in clockwise order? For example: point[0] = (5,0) point[1] = (6,4) point[2] = (4,5) point[3] = (1,5) point[4] = (1,0) would say that it is anti-clockwise (or counter-clockwise, for some people). 23 Answers 23
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Stack Overflow. Closed 1 year ago. The community reviewed whether to reopen this question 6 months ago and left it closed: Original close reason(s) were not resolved Improve … Read more
Given integer values x and y, C and C++ both return as the quotient q = x/y the floor of the floating point equivalent. I’m interested in a method of returning the ceiling instead. For example, ceil(10/5)=2 and ceil(11/5)=3. The obvious approach involves something like: q = x / y; if (q * y < … Read more
According to Google Calculator (-13) % 64 is 51. According to Javascript (see this JSBin) it is -13. How do I fix this? 13 Answers 13
How do I divide two integers to get a double? 8 Answers 8
I’m trying to convert one range of numbers to another, maintaining ratio. Maths is not my strong point. I have an image file where point values may range from -16000.00 to 16000.00 though the typical range may be much less. What I want to do is compress these values into the integer range 0-100, where … Read more
