[2.0] Finding the avarge [SOLVED]

[Rinokerpig]

Hello,

Im having a little trouble finding the avarage number from an application where the user would enter any 5 numbers. The application asks the user to enter 5 numbers and from them numbers my goal is to find the avarge number? and since im still learning C# im stuck and dunno what todo can some one please help me out. I've not yet written any code as asking the user is no problem how ever getting the avarge is .

Thanks for the help

[penagate]

Averaging numbers (finding the statistical mean) is easy - didn't you do this at school? Find the sum of all numbers, divide by the count.

int[] numbers = {1, 2, 5, 7, 2, 4, 5};
int sum = 0;

for (int i = 0; i < numbers.Length; i++) {
  sum += numbers[i];
}

float average = sum / numbers.Length;

[Rinokerpig]

Averaging numbers (finding the statistical mean) is easy - didn't you do this at school? Find the sum of all numbers, divide by the count.

int[] numbers = {1, 2, 5, 7, 2, 4, 5};
int sum = 0;

for (int i = 0; i < numbers.Length; i++) {
  sum += numbers[i];
}

float average = sum / numbers.Length;

Hello

Wow that was a fast repliy and thanks also i was never any good at math at school

Thanks

[penagate]

You're welcome!

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[Rinokerpig]

I do have one more small problem, one i did not think of I have the following code and I think im way over my head and would be greatful for some more of your help

static void Main(string[] args)
        {
            // Ask user for 5 numbers
            Console.WriteLine("Hello Please enter 5 numers: ");
            // Get users string and convert to integer
            string userInput = Console.ReadLine();
            int myConvertedString = Int32.Parse(userInput);
            int converted = Convert.ToInt32(userInput);
 
            // Use converted numbers in array
            int [] numbersEntered = { converted };
            int sum = 0;
 
            for (int i = 0; i < numbersEntered.Length; i++)
            {
                sum += numbersEntered[i];
            }
            // Find the average number
            float average = sum / numbersEntered.Length;
        }

As you may or may not know from the above im trying to get user input instead of hardcoding the numbers like you did in the first example I want the user to enter five random numbers (see below), when I go to run the application im getting this:

Hello Please enter 5 numers:
3 88 74 261 63

Unhandled Exception: System.FormatException: Input string was not in a correct f
ormat.
   at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffe
r& number, NumberFormatInfo info, Boolean parseDecimal)
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo in
fo)
   at System.Int32.Parse(String s)
   at Test.Program.Main(String[] args) in C:\learn\Test\Test\Program.cs:line 13
Press any key to continue . . .

any help you can provide would be greatfully recievied

Once again thanks

[penagate]

You need to read the numbers into an array, you can do this using String.Split()

using System.Collections.Generic;

static void Main(string[] args)
{
  Console.WriteLine("Please enter 5 numbers separated by spaces:");  
  string userInput = Console.ReadLine();
  
  string[] numberStrings = userInput.Split(' ');

  // Since you're using .NET 2.0 we can use a generic list here,
  // so that we can use the Add() method
  List<int> numbers;

  // parse each number, only use valid numbers
  for (int i = 0; i < numberStrings.Length; i++) {
    numbers.Add(int.Parse(numberStrings[i]));
  }

  // find the average
  int sum = 0;
  for (i = 0; i < numbers.Length; i++) {
    sum += numbers[i];
  }

  float average = sum / numbers.Length;

  // print it out using a format string
  Console.WriteLine("Average value is {0}", average);
}

[Rinokerpig]

Hello

Thanks once again , I'm not 100% on all that code but I'm sure/hope the MSDN help files has the explination for that

Once again thanks so much!

EDIT:

After trying this code I'm getting the following error

'System.Collections.Generic.List<int>' does not containe a definition for 'Length'

That seems to be happening on this line:

float average = sum / numbers.Length;

Under Length its got the blue scquigly line also if that helps any.

Thanks

[Rinokerpig]

Hello,

OK after a little time thinking about this its now solved using this:

static void Main(string[] args)
        {
            int[] numbers = new int[5];
            int sum = 0;
            double average = 0;

            for (int i = 0; i < numbers.Length; i++)
            {
                if (i == 0)
                {
                    Console.Write("Please, write the {0}st number: ", i + 1);
                }
                else if (i == 1)
                {
                    Console.Write("Please, write the {0}nd number: ", i + 1);
                }
                else if (i == 2)
                {
                    Console.Write("Please, write the {0}rd number: ", i + 1);
                }
                else if (i == 3)
                {
                    Console.Write("Please, write the {0}th number: ", i + 1);
                }
                else
                {
                    Console.Write("Please, write the {0}th number: ", i + 1);
                }
                numbers[i] = int.Parse(Console.ReadLine());
                sum += numbers[i];
            }
            average = (double) sum / numbers.Length;
            Console.WriteLine("The average number of the {0} given numbers is: {1}", numbers.Length, average);
        }

Once again thanks for your help

[penagate]

Sorry I didn't see your edit. My mistake, should have been Count instead of Length

[Rinokerpig]

Hi penagate,

It's ok thanks for the great help though!