Description

Problems for exercises and homework for the “C# OOP” course @ SoftUni”.
You can test your solutions here: https://judge.softuni.bg/Contests/Working-with-Abstraction-Lab
Problem 1. Rhombus of Stars
Create a program that reads a positive integer n as input and prints on the console a rhombus with size n:
Examples

input output input output input output
1 * 2 *
* *
* 3 *
* *
* * *
* *
*

input output
4 *
* *
* * *
* * * *
* * *
* *
*

Hint
Create a PrintRow() method to easily reuse code.
Problem 2. Point in Rectangle
Create a class Point and a class Rectangle. The Point should hold coordinates X and Y and the Rectangle should hold 2 Points – its top left and bottom right corners. In the Rectangle class, you should implement a Contains(Point point) method that returns true or false, based on whether the Point given as attribute is inside or outside of the Rectangle object. Points on the side of a Square are considered inside.
Input
• On the first line read the coordinates of the top left and bottom right corner of the Rectangle in the format:
“<topLeftX> <topLeftY> <bottomRightX> <bottomRightY>”.
• On the second line, read an integer N and on the next N lines, read the coordinates of points.
Output
• For each point, print out the result of the Contains() method.
Examples
input output
input output
input output
0 0 3 3
5
0 0
0 1
4 4
5 3
1 2 True
True
False
False
True 2 -3 12 3
4
8 -1
11 3
1 1
2 4 True
True
False
False 5 8 12 15
6
0 0
5 8
12 15
8 15
7 15
8 12 False
True
True
True
True
True
Problem 3. Student System
You are given a working project for a small Student System, but the code is very poorly organized. Break up the code logically into smaller functional units – methods and classes and don’t break the functionality.
The program supports the following commands:
• “Create <studentName> <studentAge> <studentGrade>” – creates a new student and adds them to the repository.
• “Show <studentName>” – prints on the console information about a student in the format:
“<studentName> is <studentAge> years old. <commentary>”, where the commentary is based on the student’s grade.
• “Exit” – closes the program.
Do not add any extra validation or functionality to the app!
Examples
input output
Create Pesho 20 5.50
Create Mimi 18 4.50
Create Gosho 25 3
Show Pesho
Show Mimi
Exit Pesho is 20 years old. Excellent student. Mimi is 18 years old. Average student.
Problem 4. Hotel Reservation
Create a class PriceCalculator that calculates the total price of a holiday, given the price per day, number of days, the season and a discount type. The discount type and season should be enums.
Use the class in your Main() method to read input and print on the console the price of the whole holiday.
The price per day will be multiplied depending on the season by:
• 1 during Autumn
• 2 during Spring
• 3 during Winter
• 4 during Summer
The discount is applied to the total price and is one of the following:
• 20% for VIP clients
• 10% for clients, visiting for a second time
• 0% if there is no discount
Input
On a single line you will receive all the information about the reservation in the format: “<pricePerDay> <numberOfDays> <season> <discountType>”, where:
• The price per day will be a valid decimal in the range [0.01…1000.00]
• The number of days will be a valid integer in range [1…1000]
• The season will be one of: Spring, Summer, Autumn, Winter
• The discount will be one of: VIP, SecondVisit, None, but it can also be omitted from the input
Output
On a single line, print the total price of the holiday, rounded to 2 digits after the decimal separator.
Examples
input output
50.25 5 Summer VIP 804.00
40 10 Autumn SecondVisit 360.00
120.20 2 Winter 721.20