Description

Problems for exercises and homework for the “C# OOP” course @ SoftUni”.
You can check your solutions here: https://judge.softuni.bg/Contests/1504/Polymorphism-Exercise
Problem 1. Vehicles
Write a program that models 2 vehicles (a Car and a 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 0.3
Truck 100 0.9
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: 54.20
Truck: 75.00
Car 30.4 0.4
Truck 99.34 0.9
5
Drive Car 500
Drive Car 13.5
Refuel Truck 10.300
Drive Truck 56.2
Refuel Car 100.2 Car needs refueling
Car travelled 13.5 km
Truck needs refueling
Car: 113.05
Truck: 109.13
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 airconditioner is turned off and does not increase the fuel consumption.
Finally, add a 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
Bus travelled 10 km
Refuel Car -10
Refuel Truck 0
Refuel Car 10
Refuel Car 300
Drive Bus 10
Refuel Bus 1000
DriveEmpty Bus 100
Refuel Truck 1000 Cannot fit 1000 fuel in the tank
Bus needs refueling
Cannot fit 1000 fuel in the tank
Car: 40.00
Truck: 100.00
Bus: 23.00
Problem 3. Wild Farm
Your task is to create a class hierarchy like the described below. The Animal, Bird, Mammal, Feline and Food classes should be abstract. Override the method ToString().
• Food – int Quantity;
▪ Vegetable;
▪ Fruit; ▪ Meat;
▪ Seeds;
• Animal – string Name, double Weight, int FoodEaten;
▪ Bird – double WingSize;
❖ Owl;
❖ Hen;
▪ Mammal – string LivingRegion;
❖ Mouse;
❖ Dog;
❖ Feline – string Breed;
• Cat;
• Tiger;
All animals should also have the ability to ask for food by producing a sound.
• Owl – “Hoot Hoot”;
• Hen – “Cluck”;
• Mouse – “Squeak”;
• Dog – “Woof!”;
• Cat – “Meow”;
• Tiger – “ROAR!!!”;
Now use the classes that you have created to instantiate some animals and feed them.
Input should be read from the console. Every even line (starting from 0) will contain information about an animal in the following format:
• Felines – “{Type} {Name} {Weight} {LivingRegion} {Breed}”;
• Birds – “{Type} {Name} {Weight} {WingSize}”;
• Mice and Dogs – “{Type} {Name} {Weight} {LivingRegion}”;
On the odd lines, you will receive information about a piece of food that you should give to that animal. The line will consist of a FoodType and quantity, separated by a whitespace.
Animals will only eat a certain type of food, as follows:
• Hens eat everything;
• Mice eat vegetables and fruits;
• Cats eat 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 have read the information about the animal and the 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]