//ERASMO, CHRISTIAN F.

//BORROMEO, ANTON V.    

//CCP 1103 - ITBC

//TUITION

using System;

public class Tuition{

  public static void Main (string[] args)

  {

    string inputTuition;

    string inputOption;

    int option;

    double tuition;

    double discount;

    double interestA;

    double interestB;

    Console.WriteLine("TUITION");

    Console.Write("Enter tuition: ");

    inputTuition = Console.ReadLine();

    if(Double.TryParse(inputTuition, out tuition) == true)

    {

        if(tuition < 5000)

        {

            Console.WriteLine("Input error, amount less than 5,000 pesos is not allowed.");

        }

        else

        {

            Console.WriteLine("Mode of payment \n[1] Full payment - 20% Discount \n[2] Installment A - 5% Interest \n[3] Installment B - 10% Interest ");

            Console.Write("Enter mode of payment: ");

            inputOption = Console.ReadLine();

            if(Int32.TryParse(inputOption, out option) == true)

            {

                switch (option)

                {

                case 1:

                    discount = (tuition - (0.2 * tuition));

                    Console.WriteLine("The tuition to pay is {0:#,0.00} pesos." ,discount);

                    break;

                case 2:

                    interestA = (tuition + (0.05 * tuition));

                    Console.WriteLine("The tuition to pay is {0:#,0.00} pesos." ,interestA);

                    break;

                case 3:

                    interestB = (tuition + (0.1 * tuition));

                    Console.WriteLine("The tuition to pay is {0:#,0.00} pesos." ,interestB);

                    break;

                default:

                    Console.WriteLine("Input error, please select from 1 to 3 only.");

                    break;

                }

            }

            else

            {

                Console.WriteLine("Invalid input, letters or special characters are not allowed.");

            }

        }

    }

    else

    {

        Console.WriteLine("Invalid input, letters or special characters are not allowed.");

    }

  }

}