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PROGRAMMING IN C#

Module 3: Statements and Operators

Module 4: Programming Constructs

Module 5: Array


Lab Guide for Lab2

Session Objectives


At the end of this session, you will able to understand:

  • Statements & Operators
  • Programming Construct
  • Array


Part 1 – Getting started (30 minutes)


Exercise 1: foreach statement


Step 1: Add a console based project ‘ForEach’ to the solution

Step 2: Right click on project ForEach -> set as Startup project

Step 3: Rename the class file ‘Program.cs’ to ‘ForEach.cs’

Step 4: Replace the code in ‘ForEach.cs’ with the given code


using System;

class ForEach

{

        static void Main(string[] args)

        {

            DateTime now = DateTime.Now;

            Random rand = new Random((int)now.Millisecond);

            int[] Arr = new int[10];

            for (int x = 0; x < Arr.Length; ++x)

            {

                Arr[x] = rand.Next() % 100;

            }

            int Total = 0;

            Console.Write("Array values are ");

            foreach (int val in Arr)

            {

                Total += val;

                Console.Write(val + ", ");

            }

            Console.WriteLine("\nAnd the average is {0,0:F1}",

                              (double)Total / (double)Arr.Length);

            Console.ReadLine();

        }

}


Step 5: Select menu File -> Save to save the file

Step 6: Select Build -> Build ‘ForEach’ option to build the project

Step 7: Select Debug -> Start without Debuging to execute the program

The output of program as following


pastedGraphic.png



Exercise 2: Array of Object


Step 1: Add a console based project ‘ObjectArray’ to the solution

Step 2: Right click on project ObjectArray -> set as Startup project

Step 3: Rename the class file ‘Program.cs’ to ‘ObjectArray.cs’

using System;

class Employee

{

        private int empID;


        // constructor

        public Employee(int empID)

        {

            this.empID = empID;

        }

        public override string ToString()

        {

            return empID.ToString();

        }

}

class ObjectArray

{

        public void Run()

        {

            int[] intArray;

            Employee[] empArray;

            intArray = new int[5];

            empArray = new Employee[3];


            // populate the array

            for (int i = 0; i < empArray.Length; i++)

            {

                empArray[i] = new Employee(i + 5);

            }


            Console.WriteLine("The int array...");

            for (int i = 0; i < intArray.Length; i++)

            {

                Console.WriteLine(intArray[i].ToString());

            }


            Console.WriteLine("\nThe employee array...");

            for (int i = 0; i < empArray.Length; i++)

            {

                Console.WriteLine(empArray[i].ToString());

            }

        }

        static void Main(string[] args)

        {

            ObjectArray arr = new ObjectArray();

            arr.Run();

            Console.ReadLine();

        }

}


Step 5: Select menu File -> Save to save the file

Step 6: Select Build -> Build ‘ObjectArray’ option to build the project

Step 7: Select Debug -> Start without Debuging to execute the program

The output of program as following


pastedGraphic_1.png



Exercise 2: Array Class


Step 1: Add a console based project ‘ArrayClass’ to the solution

Step 2: Right click on project ArrayClass -> set as Startup project

Step 3: Rename the class file ‘Program.cs’ to ‘ArrayClass.cs’

Step 4: Replace the code in ‘ArrayClass.cs’ with the given code

using System;

class ArrayClass

    {

        static void Main(string[] args)

        {

            int[] Arr = new int[12] { 29, 82, 42, 46, 54, 65, 50, 42, 5, 94, 19, 34 };

            Console.WriteLine("The first occurrence of 42 is at index "

                               + Array.IndexOf(Arr, 42));

            Console.WriteLine("The last occurrence of 42 is at index "

                               + Array.LastIndexOf(Arr, 42));

            int x = 0;

            while ((x = Array.IndexOf(Arr, 42, x)) >= 0)

            {

                Console.WriteLine("42 found at index " + x);

                ++x;

            }

            x = Arr.Length - 1;

            while ((x = Array.LastIndexOf(Arr, 42, x)) >= 0)

            {

                Console.WriteLine("42 found at index " + x);

                --x;

            }


            Console.WriteLine("Array that befor sorted");

            for (int i = 0; i < Arr.Length; i++)

            {

                Console.WriteLine("{0} :      {1}", i + 1, Arr[i]);

            }

            Array.Sort(Arr);

            Console.WriteLine("Array that after sorted");

            for (int i = 0; i < Arr.Length; i++)

            {

                Console.WriteLine("{0} :      {1}", i + 1, Arr[i]);

            }

            Array.Reverse(Arr);

            Console.WriteLine("Array that after reserse");

            for (int i = 0; i < Arr.Length; i++)

            {

                Console.WriteLine("{0} :      {1}", i + 1, Arr[i]);

            }

            Console.ReadLine();

        }

}


Step 5: Select menu File -> Save to save the file

Step 6: Select Build -> Build ‘ArrayClass’ option to build the project

Step 7: Select Debug -> Start without Debuging to execute the program

The output of program as following


pastedGraphic_2.png




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