Question

Here is my loop that asks for the group number then the donation. I’m wondering how to count the number of donations to find the average for each group.

using System;
public class TotalPurchase
{
    public static void Main()
    {

    double total4 = 0;
    double total5 = 0;
    double total6 = 0;
    int myint = -1;

    while (myint != 0)
    {
        string group;

        Console.WriteLine("Please enter group number (4, 5, or 6)");
        Console.WriteLine("(0 to quit): ");
        group = Console.ReadLine();
        myint = Int32.Parse(group);

        switch (myint)
        {
            case 0:
                break;
            case 4:
                double donation4;
                string inputString4;
                Console.WriteLine("Please enter the amount of the contribution: ");
                inputString4 = Console.ReadLine();
                donation4 = Convert.ToDouble(inputString4);
                total4 += donation4;
                break;
            case 5:
                double donation5;
                string inputString5;
                Console.WriteLine("Please enter the amount of the contribution: ");
                inputString5 = Console.ReadLine();
                donation5 = Convert.ToDouble(inputString5);
                total5 += donation5;
                break;
            case 6:
                double donation6;
                string inputString6;
                Console.WriteLine("Please enter the amount of the contribution: ");
                inputString6 = Console.ReadLine();
                donation6 = Convert.ToDouble(inputString6);
                total6 += donation6;
                break;
            default:
                Console.WriteLine("Incorrect grade number.", myint);
                break;
        }
    }

    Console.WriteLine("Grade 4 total is {0}", total4.ToString("C"));
    Console.WriteLine("Grade 5 total is {0}", total5.ToString("C"));
    Console.WriteLine("Grade 6 total is {0}", total6.ToString("C"));

    }
}

Any help would be appreciated.

Answer 1

using System;

public class TotalPurchase
{
    public static void Main()
    {
       double total4 = 0;
       double total5 = 0;
       double total6 = 0;

       int numberOfInputForTotal4 = 0;
       int numberOfInputForTotal5 = 0;
       int numberOfInputForTotal6 = 0;

       int myint = -1;

        while (myint != 0)
        {
            string group;

            Console.WriteLine("Please enter group number (4, 5, or 6)");
            Console.WriteLine("(0 to quit): ");
            group = Console.ReadLine();
            myint = Int32.Parse(group);

            switch (myint)
            {
                case 0:
                    break;
                case 4:
                    double donation4;
                    string inputString4;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString4 = Console.ReadLine();
                    donation4 = Convert.ToDouble(inputString4);
                    total4 += donation4;
                    numberOfInputForTotal4++;
                    break;
                case 5:
                    double donation5;
                    string inputString5;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString5 = Console.ReadLine();
                    donation5 = Convert.ToDouble(inputString5);
                    total5 += donation5;
                    numberOfInputForTotal5++;
                    break;
                case 6:
                    double donation6;
                    string inputString6;
                    Console.WriteLine("Please enter the amount of the contribution: ");
                    inputString6 = Console.ReadLine();
                    donation6 = Convert.ToDouble(inputString6);
                    total6 += donation6;
                    numberOfInputForTotal6++;
                    break;
                default:
                    Console.WriteLine("Incorrect grade number.", myint);
                    break;
            }
        }

        Console.WriteLine("Grade 4 total is {0}", total4.ToString("C"));
        Console.WriteLine("Grade 5 total is {0}", total5.ToString("C"));
        Console.WriteLine("Grade 6 total is {0}", total6.ToString("C"));

        Console.WriteLine("Grade 4 average is {0}", (total4 / numberOfInputForTotal4).ToString("C"));
        Console.WriteLine("Grade 5 average is {0}", (total5 / numberOfInputForTotal5).ToString("C"));
        Console.WriteLine("Grade 6 average is {0}", (total6 / numberOfInputForTotal6).ToString("C"));

    }
}

As you can see, there are 3 extra variables (one for each group) that can be used to figure out the number of inputs provided. Using that you can divide the total for each group by the number of input in each group separately.