Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

You are not logged in. #1 20090119 16:05:31
Little GemsEver have little programming gems? Code:while (angle>360) { angle = 360; } etc... You can use this "little gem": Code:angle = round(angle/360  0.5)*360; // this little gem makes sure angle is >=0 and <360 "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman #2 20090120 05:57:39
Re: Little GemsBe careful! If the type of 'angle' is an integer, the real maths involved in the second example can result in a loss of accuracy. What may be better for an integer, might be to take the value modulo 360. Also, the first piece of code does nothing where the value of the angle is already less than zero. #3 20090120 07:17:54
Re: Little GemsSo the "gem" should be written as: Code:angle = round(angle/360.0  0.5)*360; // this little gem makes sure angle is >=0 and <360 Noting the ".0" on the first 360.
Actually, I'm pretty sure the first piece of code won't run. I don't think "etc..." is a proper function call. "In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..." #4 20090120 08:13:37
Re: Little Gems
True, depending on language. But in pseudocode it works perfectly "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman 