如何动态地向数组中存数据，而且新的覆盖老的。

const int SPEED_COUNT = 10;

void setSpeed(float speed)
        {
            for(int i = SPEED_COUNT - 1;i>0;i--)
            {
                this.mSpeed[i] = this.mSpeed[i - 1];
            }
            this.mSpeed[0] = speed;
        }