Question

I have three numbers that I have defined:

#define kBallSpeedX = 4;
#define kBallSpeedY = 3;
#define kCpuSpeed = 3.25;

But I want these numbers to change when the other part of a segmented controller is selected. How do I do this?

Answer 1

Firstly, you don’t define macros like this – it should be:

#define kBallSpeedX 4
#define kBallSpeedY 3
#define kCpuSpeed 3.25

Secondly, you shouldn’t really be using macros – use actual variables (and make them const if appropriate), e.g.

double kBallSpeedX = 4.0;
double kBallSpeedY = 3.0;
const double kCpuSpeed = 3.25;

You can then modify kBallSpeedX, kBallSpeedY as appropriate.