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Exercises: Polymorphism
Problem 1. Vehicles
Write a program that models 2 vehicles ( Car and Truck ) and simulates driving and refueling them. Car and truck both have fuel quantity , fuel consumption in liters per km and can be driven a given distance and refueled with a given amount of fuel. It’s summer, so both vehicles use air conditioners and their fuel consumption per km is increased by 0.9 liters for the car and with 1.6 liters for the truck. Also, the truck has a tiny hole in its tank and when its refueled it keeps only 95% of the given fuel. The car has no problems and adds all the given fuel to its tank. If a vehicle cannot travel the given distance, its fuel does not change.
Input
On the first line – information about the car in the format: "Car {fuel quantity} {liters per km}" On the second line – info about the truck in the format: "Truck {fuel quantity} {liters per km}" On the third line – the number of commands N that will be given on the next N lines On the next N lines – commands in the format : "Drive Car {distance}" "Drive Truck {distance}" "Refuel Car {liters}" "Refuel Truck {liters}"
Output
After each Drive command , if there was enough fuel, print on the console a message in the format: "Car/Truck travelled {distance} km" If there was not enough fuel , print : "Car/Truck needs refueling" After the End command, print the remaining fuel for both the car and the truck, rounded to 2 digits after the floating point in the format: "Car: {liters}" "Truck: {liters}"
Examples
Input Output Car 15 0. Truck 100 0. 4 Drive Car 9 Drive Car 30 Refuel Car 50 Drive Truck 10 Car travelled 9 km Car needs refueling Truck travelled 10 km Car: 54. Truck: 75. Car 30.4 0. Truck 99.34 0. 5 Drive Car 500 Drive Car 13. Refuel Truck
Drive Truck 56. Refuel Car 100. Car needs refueling Car travelled 13. km Truck needs refueling Car: 113. Truck: 109.
Problem 2. Vehicles Extension
Use your solution of the previous task for the starting point and add more functionality. Add a new vehicle – Bus. Add to every vehicle a new property – tank capacity. A vehicle cannot start with or refuel above its tank capacity. If you try to put more fuel in the tank than the available space, print on the console "Cannot fit {fuel amount} fuel in the tank" and do not add any fuel in the vehicle’s tank. If you try to create a vehicle with more fuel than its tank capacity , create it but start with an empty tank. Add a new command for the bus. You can drive the bus with or without people. With people , the air-conditioner is turned on and its fuel consumption per kilometer is increased by 1.4 liters. If there are no people in the bus , the air-conditioner is turned off and does not increase the fuel consumption. Finally, add validation for the amount of fuel given to the Refuel command – if it is 0 or negative, print "Fuel must be a positive number".
Input
On the first three lines you will receive information about the vehicles in the format: "Vehicle {initial fuel quantity} {liters per km} {tank capacity}" On the fourth line – the number of commands N that will be given on the next N lines On the next N lines – commands in format: "Drive Car {distance}" "Drive Truck {distance}" "Drive Bus {distance}" "DriveEmpty Bus {distance}" "Refuel Car {liters}" "Refuel Truck {liters}" "Refuel Bus {liters}"
Output
After each Drive command , if there was enough fuel, print on the console a message in the format: "Car/Truck travelled {distance} km" If there was not enough fuel , print : "Car/Truck needs refueling" If you try to refuel with an amount ≤ 0 print: "Fuel must be a positive number" If the given fuel cannot fit in the tank , print: "Cannot fit {fuel amount} fuel in the tank" After the End command, print the remaining fuel for all vehicles, rounded to 2 digits after the floating point in the format: "Car: {liters}" "Truck: {liters}" "Bus: {liters}"
Example
Input Output Car 30 0.04 70 Truck 100 0.5 300 Bus 40 0.3 150 8 Fuel must be a positive number Fuel must be a positive number Cannot fit 300 fuel in the tank
Hens eat everything ; Mice eat vegetables and fruits ; Cats east vegetables and meat ; Tigers , Dogs and Owls eat only meat ; If you try to give an animal a different type of food, it will not eat it and you should print: "{AnimalType} does not eat {FoodType}!" The weight of an animal will increase with every piece of food it eats , as follows: Hen – 0.35; Owl – 0.25; Mouse – 0.10; Cat – 0.30; Dog – 0.40; Tiger – 1.00; Override the ToString() method to print the information about an animal in the formats: Birds – "{AnimalType} [{AnimalName}, {WingSize}, {AnimalWeight}, {FoodEaten}]" Felines – "{AnimalType} [{AnimalName}, {Breed}, {AnimalWeight}, {AnimalLivingRegion}, {FoodEaten}]" Mice and Dogs – "{AnimalType} [{AnimalName}, {AnimalWeight}, {AnimalLivingRegion}, {FoodEaten}]" After you read information about an animal and some food , the animal will produce a sound ( print it on the console ). Next, you should try to feed it. After receiving the “ End ” command, print information about every animal in order of input.
Input Output
Cat Pesho 1.1 Home Persian Vegetable 4 End Meow Cat [Pesho, Persian, 2.3, Home, 4] Tiger Typcho 167.7 Asia Bengal Vegetable 1 Dog Doncho 500 Street Vegetable 150 End
ROAR!!!
Tiger does not eat Vegetable! Woof! Dog does not eat Vegetable! Tiger [Typcho, Bengal, 167.7, Asia, 0] Dog [Doncho, 500, Street, 0] Mouse Jerry 0.5 Anywhere Fruit 1000 Owl Toncho 2.5 30 Meat 5 End Squeak Hoot Hoot Mouse [Jerry, 100.5, Anywhere, 1000] Owl [Toncho, 30, 3.75, 5]
