arraybsp.cs

using System;
using System.Linq;

namespace bsp30
{

	/* 30. (2P)Schreibe 5 Funktionen, welche von einem eindimensionalen Fließkommazahlen-Array (Parameter der Funktion) beliebiger Größe 
	 * 			Durchschnitt
	 * 			Summe
	 * 			Standardabweichung
	 * 			Minimum
	 * 			Maximum 
	 * 
	 * der Daten berechnen und zurückgeben. */

	class MainClass
	{
		static double[] data; 

		// main
		static void Main (string[] args)
		{
			data = new double[6]
			{2, 4, 6, 8, 10, 12};
			readInNumbersCommandLine();
			Console.WriteLine("Summe: " + Summe());
			Console.WriteLine("Durchschnitt: " + Durchschnitt());
			Console.WriteLine("Maximum: " + Maximum());
			Console.WriteLine("Minimum: " + Minimum());
			Console.WriteLine("Standardabweichung: " + Standardabweichung());
		} // end of main


		// function to read in usernumbers
		static int readInNumbersCommandLine()
		{
			Console.WriteLine("type in the width of your array:");
			int input = secureDoubleInput();
			return input;
		} // end of function


		// secure input
		static int secureDoubleInput()
		{
			string stringInput;
			int result;
			bool success = true;

			do
			{
				if (!success)
				{
					Console.WriteLine("your number is not valid, try again");
				} 
				stringInput = Console.ReadLine();
				success = int.TryParse(stringInput, out result);
			}
			while (!success);

			return result;
		} // end of function


		// check user input for mistakes like negative numbers or strings
		static double checkInput (double min, double max)
		{
			bool inputIsOK;
			double userInput;

			do {
				inputIsOK = double.TryParse (Console.ReadLine (), out userInput);

				if ((inputIsOK == true) && (userInput >= min) && (userInput <= max)) {
					inputIsOK = true;
				} else {
					inputIsOK = false;
					Console.WriteLine ("try again, your input is wrong!");
				}
			} while (inputIsOK == false);
			return userInput;
		} // end of function



		// function for the sum
		static double Summe()
		{ 
			double sum = 0;
			for (int i = 0; i < data.Length; i++)
				{
					sum += data[i];
				}
			return sum;	
		} // end of function



		// function for average
		static double Durchschnitt ()
		{
			double average = Summe() / data.Length;
			return average;
		} // end of function



		// function for max
		static double Maximum()
		{
			double max = data.Max();
			return max;
		} // end of function



		// function for min
		static double Minimum()
		{
			double min = data.Min();
			return min;
		} // end of function



		// function for standard deviation
		static double Standardabweichung()
		{ 
			double average = Durchschnitt();
			double sumOfSquares = data.Select(val => (val - average) * (val - average)).Sum();
			double sd = Math.Sqrt(sumOfSquares / data.Length);
			return sd;
		} // end of function
	} 
}