Objective:Write an abstract Vehicle class. In this exercise, you willl write an abstract Vehicle class that has the structure shown in this diagram:

When working with C++, overload the << operator instead of using a toString() method.
The accelerate() and decelerate() methods should be used to change the speed. However, they are subject to the constraints that the speed is always greater than or equal to zero and less than or equal to maxSpeed. Attempts to increase speed above maxSpeed or decrease it below 0 should simply pin the speed to the boundaries.

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