[Kalcor]

Quote:

Originally Posted by stepmex All is considered

Not really because you're assuming the KEY_SPRINT was pressed before KEY_JUMP, or any other key for that matter. What happens if they're both pressed at the same time or a new key is added in to the equation?

newkeys = 40 (KEY_JUMP | KEY_SPRINT)
oldkeys = 0

newkeys - oldkeys = 40. if (40 == KEY_JUMP) is false. Now you miss the condition to detect it being pressed.

When dealing with bits you use bitwise & (AND) or | (OR). If you use arithmetic you won't be testing individual bits but combinations of bits.