C# Exercises

DateStrings.cs

// Exercise - 4 - Date and Strings

using System;
using System.Collections.Generic;
using System.Text;

namespace CSharpTask
{
    class DateString
    {
        private string NumToWord (int num) {

            IDictionary<int, string> NumDictonary = new Dictionary<int, string>
            {
                { 0, "" },
                { 1, "One" },
                { 2, "Two" },
                { 3, "Three" },
                { 4, "Four" },
                { 5, "Five" },
                { 6, "Six" },
                { 7, "Seven" },
                { 8, "Eight" },
                { 9, "Nine" },
                { 10, "Ten" },
                { 11, "Eleven" },
                { 12, "Twelve" },
                { 13, "Thirteen" },
                { 14, "Fourteen" },
                { 15, "Fifteen" },
                { 16, "Sixteen" },
                { 17, "Seventeen" },
                { 18, "Eighteen" },
                { 19, "Nineteen" },
                { 20, "Twenty" },
                { 30, "Thirty" },
                { 40, "Forty" },
                { 50, "Fifty" },
                { 60, "Sixty" },
                { 70, "Seventy" },
                { 80, "Eighty" },
                { 90, "Ninety" }
            };

            if (num < 20)
            {
                return NumDictonary[num];
            }
            else if (num < 100)
            {
                if (num % 10 == 0)
                    return NumDictonary[num];
                else
                    return NumDictonary[(num / 10) * 10] + NumDictonary[num % 10];
            }
            else if (num < 1000)
            {
                if (num % 100 == 0)
                    return NumToWord(num / 100) + " Hundred ";
                else
                    return NumDictonary[num / 100] + " Hundred " + NumToWord(num % 100);
            }
            else
            {
                if (num % 1000 == 0)
                    return NumToWord(num / 1000) + " Thousand ";
                else
                    return NumDictonary[num / 1000] + " Thousand " + NumToWord(num % 1000);
            }
        }

        private string NumToMonth(int num) {
            IDictionary<int, string> MonthDictonary = new Dictionary<int, string>
            {
                { 1, "January" },
                { 2, "February" },
                { 3, "March" },
                { 4, "April" },
                { 5, "May" },
                { 6, "June" },
                { 7, "July" },
                { 8, "August" },
                { 9, "September" },
                { 10, "October" },
                { 11, "November" },
                { 12, "December" }
            };
            if (num < 0 && num > 12)
            {
                throw new System.ArgumentException("Invalid argument", "Month");
            }
            return MonthDictonary[num];

        }
        public static void Main(string[] args)
        {
            string DateWordString;
            DateString dateString = new DateString();
            DateTime dateTime = DateTime.UtcNow.Date;

            string timeNow = dateTime.ToString("yyyy/MM/dd").Replace('-', '/');
            Console.WriteLine(timeNow);

            string[] DateParts = timeNow.Split('/');

            DateWordString = $"{dateString.NumToWord(Int32.Parse(DateParts[0]))}" +
                         $" / {dateString.NumToMonth(Int32.Parse(DateParts[1]))}" +
                         $" / {dateString.NumToWord(Int32.Parse(DateParts[2]))}";
            Console.WriteLine(DateWordString);
            Console.ReadKey();
        }
    }
}

Patient.cs

// Exercise - 2  - Class Concept
using System;

namespace CSharpTask
{
    class Patient
    {
        private static string firstName;
        public static string FirstName { get { return firstName; } set { firstName = value; } }
        private static string lastName;
        public static string LastName { get { return lastName; } set { lastName = value; } }
        private static int age;
        public static int Age { get { return age; } set { age = value; } }
        private static char gender;
        public static char Gender
        {
            get { return gender; } 
            set
            {
                if (Char.ToUpper(value) == 'M' || Char.ToUpper(value) == 'F' || Char.ToUpper(value) == 'O')
                {
                    gender = value;
                }
                else
                {
                    throw new System.ArgumentException("Gender can only be Male Female or Other", "Gender");
                }
            }

        }

        public static string GetFullName()
        {
            return firstName + " " + lastName;
        }
    }

    public class PatientUser
    {
        public static void Main(string[] args)
        {
            Patient.FirstName = "Amal";
            Patient.LastName = "Shajan";
            Patient.Age = 21;
            Patient.Gender = 'M';
            Console.WriteLine(Patient.FirstName);
            Console.WriteLine(Patient.LastName);
            Console.WriteLine(Patient.GetFullName());
            Console.WriteLine(Patient.Age);
            Console.WriteLine(Patient.Gender);
            Console.ReadKey();

        }
    }
}

PatienttAccount.cs

// Exercise - 4 - Date and Strings

using System;
using System.Collections.Generic;
using System.Text;

namespace CSharpTask
{
    [Serializable()]
    public class InsufficientBalanceException : System.Exception
    {
        public InsufficientBalanceException() : base() { }
        public InsufficientBalanceException(string message) : base(message) { }
        public InsufficientBalanceException(string message, System.Exception inner) : base(message, inner) { }
        protected InsufficientBalanceException(System.Runtime.Serialization.SerializationInfo info,
            System.Runtime.Serialization.StreamingContext context)
        { }
    }

    class PatienttAccount
    {
        private double credit;

        protected void AddToPatientCredit(double creditAmount)
        {
            credit += creditAmount;
        }

        protected double CheckPatientBalance()
        {
            return credit;
        }

        protected void WithDrawFromPatientCredit(double amount)
        {
            if (credit - amount < 0) {
                throw new InsufficientBalanceException("Insufficient balance");
            }
            credit -= amount;
        }

        protected double CalculateIntrest(int month)
        {
            return credit * 0.24 * month;
        }
    }

    class Newton : PatienttAccount
    {
        public static void Main(string[] args)
        {
            Newton newton = new Newton();

            newton.AddToPatientCredit(100.50);
            Console.WriteLine($"Balance : { newton.CheckPatientBalance() }");

            try
            {
                newton.WithDrawFromPatientCredit(20.7);
                Console.WriteLine($"Balance : { newton.CheckPatientBalance() }");
            }
            catch (InsufficientBalanceException e)
            {
                Console.WriteLine(e);
            }
            Console.WriteLine("Intrest for one month: " + newton.CalculateIntrest(1) );

            Console.ReadKey();
        }
    }
}

Questions.txt

Exercise - 2  - Class Concept

Create a Patient Class for Andrew with the following Properties

FirstName
LastName
Age
Gender

All these properties should have a get and set methods. The methods in this Patient class should be used be used by other class by not creating objects for Patient class.

Exercise - 3 - Collections

Create a collection to store the details of a patient as Key, Value Pairs. This collection should be able to accept any data-type. The following should be stored in the collection

FirstName
LastName
Age
Gender

Exercise - 4 - Date and Strings

Write a program to get the current date in the format YYYY/MM/DD and display it in the console. Also convert this date into words and print it. 

Eg: 2017/10/01 => Two Thousand Seventeen / October / One

Exercise - 5 - Class, Method, Access Specifier, Exception Handling

Write a class “PatientCreditDebitAccount” with the following methods

AddToPatientCredit()
CheckPatientBalance()
WithDrawFromPatientCredit()
CalculateInterest() => interest rate for a month is 2.4%

Use access specifiers for methods and properties based on its visibility.

Create another class “Newton” and inherit the class “PatientCreditDebitAccount”. The following logic should be enclosed in a try catch block

Credit 100.50$ to Newton's account
Debit 20.70$ from Newton’s account
Check the Balance
Calculate the interest for the amount in the account for a month




Exercise-1 - Problem Statement:

Andrew is a Patient at Lister Dental Practice (LDP). He owns an insurance Policy such that his Dental Procedures will be waived off 33% from the total billed amount except for the Procedure D0120 and for all Medical Procedure 58% is waived off. The initial credit he owns in his account is $200.

One day he walks into LDP for his Appointment that was scheduled two weeks earlier. His appointment has got 5 procedures to be done(3 dental 2 medical). The details of the Procedures are as follows

D0130 	- $85
D0120	- $126
D0140	- $200
20304	- $10
34567	- $99

Display the following in console

The amount he has to pay for each code:
The total amount he has to pay from credit:
The balance credit in his account after treatment:
The discount he will get by using his insurance:
The total amount he has to pay at LDP if any:

Now Andrew decides not to perform a Procedure of his choice after seeing all the details. Now again display the following in console after getting his choice.

The amount he has to pay for each code:
The total amount he has to pay from credit:
The balance credit in his account after treatment:
The discount he will get by using his insurance:
The total amount he has to pay at LDP if any:




The Development code must contain the following.

1. Constants
2. Array
3. For loop
4. Multiple data types
5. Decision Statement
6. Operators
7. Methods, Variables