mathematics - rotating an object from sourceAngle to destAngle, both 0-359, clockwise or counter clockwise?

I've got a game object i need to rotate. It's current angle is player.rotation, the destination is targetAngle, both in degress, 0 to 359. I've got a function named rotateDirection(float sourceAngle, float destAngle) that needs to return -1 or 1 depending on whether the shortest way to reach the destination angle would be clockwise or counterclockwise.

For example - for sourceAngle 300 and destAngle 0 the function would return 1 for clockwise.

The solution is most probably going to leave me looking silly, and i usually don't like just asking for code, but my brain is completely broken so please help me with this one :)

Answer

This should do:

(((source-dest+360) mod 360)>180)?1:-1

The +360 is only necessary for languages with a fuzzy mod function. Note that most languages implement fuzzy mod.