A computer game is being designed that will include different vehicles. A prototype for the game is being developed using object-oriented programming. The class Vehicle stores data about the vehicles. Each vehicle has an identification name, a maximum speed, a current speed and a horizontal position. The value IncreaseAmount is added to the current speed each time the vehicle increases its speed. Vehicle ID: STRING stores the identification name for the vehicle MaxSpeed : INTEGER stores the maximum speed CurrentSpeed : INTEGER stores the current speed IncreaseAmount : INTEGER stores the amount CurrentSpeed increases by HorizontalPosition : INTEGER stores the horizontal position Constructor() initialises ID, MaxSpeed and IncreaseAmount to the parameter values initialises both CurrentSpeed and HorizontalPosition to 0 GetCurrentSpeed() returns the current speed GetIncreaseAmount() returns the increase amount GetHorizontalPosition() returns the horizontal position GetMaxSpeed() returns the maximum speed SetCurrentSpeed() assigns the parameter to the current speed SetHorizontalPosition() assigns the parameter to the horizontal position IncreaseSpeed() calculates and stores the new speed and horizontal position of the vehicle

1. (a)(i)Write program code to declare the class Vehicle. All attributes must be private. You only need to declare the class and its constructor. Do not declare any other methods. Use your programming language's appropriate constructor. If you are writing program code in Python, include attribute declarations using comments.[5]
2. (a)(ii)Write program code for the get methods GetCurrentSpeed(), GetIncreaseAmount(),GetMaxSpeed() and GetHorizontalPosition()[3]
3. (a)(iii)Write program code for the set methods SetCurrentSpeed() and SetHorizontalPosition()[3]
4. (a)(iv)The method IncreaseSpeed(): • adds IncreaseAmount to the current speed • adds the updated current speed to the horizontal position. The current speed of a vehicle cannot exceed its maximum speed. Write program code for the method IncreaseSpeed()[3]
5. (b)(i)The child class Helicopter inherits from the parent class Vehicle. A helicopter also has a vertical position and changes the vertical position when it increases speed. Helicopter VerticalPosition : INTEGER stores the vertical position VerticalChange : INTEGER stores the amount VerticalPosition changes by MaxHeight : INTEGER stores the maximum height the helicopter can reach Constructor() takes the ID, maximum speed, increase amount, vertical change and maximum height as parameters initialises the vertical position to 0 GetVerticalPosition() returns the vertical position IncreaseSpeed() changes the current speed, horizontal and vertical position of the helicopter Write program code to declare the class Helicopter. You only need to declare the class and its constructor. You do not need to declare the other methods. Use your programming language's appropriate constructor. All attributes must be private. If you are writing in Python, include attribute declarations using comments.[5]
6. (b)(ii)The Helicopter method IncreaseSpeed() overrides the method from the parent class and: • adds the amount of vertical change to the vertical position • adds IncreaseAmount to the current speed • adds the updated current speed to the horizontal position. The vertical position of a helicopter cannot exceed its maximum height. The current speed of a helicopter cannot exceed its maximum speed. Write program code for the method IncreaseSpeed()[4]
7. (c)A procedure needs to output the horizontal position and speed of a vehicle. If the vehicle is a helicopter, it also outputs the vertical position. All outputs must include appropriate messages. Write program code for this procedure.[3]
8. (d)(i)The main program needs to: • instantiate a car as a new vehicle with the ID "Tiger", a maximum speed of 100 and an increase amount of 20 • instantiate a new helicopter with the ID "Lion", a maximum speed of 350, an increase amount of 40, a vertical change of 3 and a maximum height of 100 • call IncreaseSpeed() twice for the car and then call the output procedure from part 2(c) for the car • call IncreaseSpeed() twice for the helicopter and then call the output procedure from part 2(c) for the helicopter. Write program code for the main program.[5]
9. (d)(ii)Test your program. Take a screenshot of the output.[1]