Arrays(Morning)

String arrays

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ArraysExampleMorning
{
    class Program
    {
        static void Main(string[] args)
        {
            //declare a string array. an array is
            //a variable that can store more than 
            //one value at a time. It is marked by
            //the use of squlare brackets [] after 
            //the data type
            string[] members;

            //before you can use an array
            //you must make it new and give
            //it a length
            //each member of an array
            //has an index number to identify
            //it. Indexes always start at 0
            members = new string[7];
            members[0] = "Brad";
            members[1] = "Josephine";
            members[2] = "Paul";
            members[3] = "Alice";
            members[4] = "Lewis";

            //here we added the last member
            //but not the fifth
            members[6] = "Sally";

            //you can access members by means of their index
            Console.WriteLine("the third member is " + members[2]);

            //this loops through the array members
            for (int i = 0; i < members.Length;i++ )
            {
                //if the value for the index is not empty
                if(members[i] != null)
                { 
                    //print it
                    Console.WriteLine(members[i]);
                }
            }

            //an alternate way of initializing an array.
            //just less typing
            string[] colors = new string[] { "red", "green", "blue", "purple", "yellow" };

            //you can use a variable for the size of the array
            //as long as you assign a value to the variable
            //before you initialize the array
            Console.WriteLine("How many books do you want to enter");
            int numberOfBooks = int.Parse(Console.ReadLine());

            string[] books = new string[numberOfBooks];

            //loop through the array to add values
            for (int i = 0; i < books.Length; i++ )
            {
                Console.WriteLine("Enter a Book");
                books[i] = Console.ReadLine();
            }

            Console.WriteLine("******************");
            //loop through the array to display
            //its contents
            for (int i = 0; i < books.Length; i++ )
            {
                Console.WriteLine(books[i]);
            }

                Console.ReadKey();

        }
    }
}

Number Arrays

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NumberArraysMorning
{
    class Program
    {
        /// <summary>
        /// this program shows how to manipulate number
        /// arrays
        /// </summary>
     
        static void Main(string[] args)
        {
            //make a new random number
            Random rand = new Random();

            //declare an array. an array is a variable
            //that can store more than one value
            //at a time. An array is marked by using
            //square brackets [] after the data type
            //an array must always have a value fo length 
            //before you can use it. Arrays are also
            //objects and must be made new to use
            int[] numberArray = new int[50];
            int ones = 0, twos = 0, threes = 0, fours = 0;

            //populate the array
            for(int i=0;i<numberArray.Length;i++)
            {
                //at each index (represented by the
                //counter i )place a random number
                //between 1 and 4
                numberArray[i] = rand.Next(1, 5);
            }

            //loop through the array and count how
            //many of each number there is
            for (int i = 0; i < numberArray.Length; i++)
            {
                if (numberArray[i] == 1) { ones++; }
                if (numberArray[i] == 2) { twos++; }
                if (numberArray[i] == 3) { threes++; }
                if (numberArray[i] == 4) { fours++; }
              
            }

            //display the results
            Console.WriteLine("ones {0}, twos {1}, threes {2}, fours {3} ",
                ones,twos,threes,fours);

            //make string with the same number of astrics
            //as the number of ones
            Console.Write("\nOnes\t");
            for (int i = 0; i < ones; i++ )
            {
                Console.Write("*");
            }
            //twos
            Console.Write("\nTwos\t");
            for (int i = 0; i < twos; i++)
            {
                Console.Write("*");
            }
            //threes
            Console.Write("\nThrees\t");
            for (int i = 0; i < threes; i++)
            {
                Console.Write("*");
            }
            //fours
            Console.Write("\nFours\t");
            for (int i = 0; i < fours; i++)
            {
                Console.Write("*");
            }

            //new array of 50 elements
            int[] numberArrayB = new int[50];
            //populate the array with numbers between
            //1 and 999
            for (int i = 0; i < numberArrayB.Length; i++ )
            {
                numberArrayB[i] = rand.Next(1, 1000);
            }

            //declare a vaiable to store the maximum
            int max = 0;
            //loop through the array
            for (int i = 0; i < numberArrayB.Length; i++)
            {
                //check to see if the number at the index
                //is bigger than the current max
                //if it is replace max with the new number
                if (numberArrayB[i] > max)
                {
                    max = numberArrayB[i];
                }
            }

            //declare variables
            int sum = 0; 
            double average = 0;
            //loop and accumulate values into a sum
            for (int i = 0; i < numberArrayB.Length; i++)
            {
                sum += numberArrayB[i];
                //same as sum = sum + numberArrayB[i];
            }

            //get the average
            average = (double)sum / numberArrayB.Length;
            
            //display the average
            Console.WriteLine("\nthe average is {0}", average);

            //two ways to do max--our loop above
            //and using the Max() function built into arrays
            //Console.WriteLine("\nthe max is " + max);
            Console.WriteLine("\nthe max is " + numberArrayB.Max());
                Console.ReadKey();
        }
    }
}