我有三个数字,我已经定义了:
#define kBallSpeedX = 4;
#define kBallSpeedY = 3;
#define kCpuSpeed = 3.25;
但我希望当选择了部分控制器的另一部分时,这些数字会改变。 我该怎么做呢?
我有三个数字,我已经定义了:
#define kBallSpeedX = 4;
#define kBallSpeedY = 3;
#define kCpuSpeed = 3.25;
但我希望当选择了部分控制器的另一部分时,这些数字会改变。 我该怎么做呢?
首先,你没有这样定义宏 - 它应该是:
#define kBallSpeedX 4
#define kBallSpeedY 3
#define kCpuSpeed 3.25
其次,你不应该真的使用宏 -- -- 使用实际变量(如果适当的话,使其相互一致),例如:
double kBallSpeedX = 4.0;
double kBallSpeedY = 3.0;
const double kCpuSpeed = 3.25;
您可以酌情修改 kBallSpeedX, kBallSpeedY 。
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