C＃-夹角与使用模数

Question

What is the difference between clamping an angle like in the following code

do
 {
   if(angle < -360)
   {
     angle += 360;
   }
   if(angle > 360)
   {
     angle -= 360;
   }
 }while(angle < -360 || angle > 360);

... and using the modulo arithmetics;

angle = angle % 360;

... and if this is relevant for the Unity game engine.

Answer 1

Assuming angle is an integer, the difference is that your clamp code allows angles of exactly -360 or +360 degrees. Modulo would reduce that to zero.

The comments speak of a difference in handling negative values. Those comments are wrong. Both approaches would leave -10 as -10 .

If angle isn't an integer type though, if it's double for instance, the % operator may give different results than repeated addition or subtraction, due to repeated addition or subtraction introducing rounding problems. In that case, the % operator would be a better match. You'd need excessively large angles for this to become a problem though, and with those excessively large angles, you don't have enough precision to represent angles accurately anyway.