Question

Question is:
Write a program that reads data into an array of type int. Valid inputs are from 0 to 10. Your program should determine how many values were inputted. Output a list of distinct entries and a count of how many times that entry occurred.

I have so far:

using System;  
using System.Collections;
namespace ConsoleApplication25
{
class Program
{
   static void Main()
    {
        ArrayList list = new ArrayList();
        string inValue;

        Console.WriteLine("Please enter a value from 0-10");
        Console.WriteLine("To end the program, type 11");
        for (int i = 0; i < 11; i++)
        {
            Console.Write("Enter Value:", i);
            inValue = Console.ReadLine();
            i = int.Parse(inValue);
            list.Add(i);
            list.Remove(11);
            list.Sort();
        }
        int[] c = list.ToArray(typeof(int)) as int[];

        foreach (int value in c)
        {
            Console.WriteLine(value);
        }
        Console.WriteLine("There are {0} values.", list.Count);

        }
    }
}

Where I’m stuck at is displaying a count of each value. I have tried setting up an if with a counter, and setting up cases with breaks and have been unsuccessful. We haven’t started using LINQ yet. Any suggestions or hints would be greatly appreciated.

Thanks,

Jason

Answer 1

Use Dictionary<int, int> to store value and count of how many times it occured. Short example:

Dictionary<int, int> values = new Dictionary<int, int>();
...
Console.Write("Enter Value:", i);
inValue = Console.ReadLine();
i = int.Parse(inValue);
if(values.ContainsKey(i))
{
    values[i]++;
}
else
{
    values.Add(i, 1);
}
...