Lab Tutorial - 4

Sample Format for file upload.docx

 

1 : The employee list for a company contains employee code, name, designation and basic pay. The employee is given a house rent allowance (HRA) of 10% of the basic pay and dearness allowance (DA) of 45% of the basic pay. The total pay of the employee is calculated as Basic Pay + HRA + DA. Write a class to define the details of the employee. Write a constructor to assign the required initial values. Add a method to calculate HRA, DA and total pay and print them. Write another class with main method. Create objects for three different employees and calculate HRA, DA and total pay.

 

2 : From the following code and given output, complete missing statements and find out error code and correct it.

Solution:

//Base class or Parent class.

class Shape

{

    public double Width;

    public double Height;

    public void ShowDim()

    {

        Console.WriteLine("Width and height are " +  Width + " and " + Height);

    }

}

// Triangle is derived from Shape.

//Drived class or Child class.

class Triangle : Shape

{

    public string Style; // style of triangle

    // Return area of triangle.

 //………………………………Missing statement-1……………………………….//        

    {

        return Width * Height / 2;

    }

    // Display a triangle's style.

    public void ShowStyle()

    {

//………………………………Missing statement-2……………………………….//     

    }

}

//Driver class which runs the program.

class Driver

{

    static void Main()

    {

        Triangle t1 new Triangle();

        Triangle t2 new Triangle();

       

        t1.Width =4.0;

        t1.Height =4.0;

        t1.Style ="isosceles";

        t2.Width =8.0;

        t2.Height =12.0;

        t2.Style ="right";

 

        Console.WriteLine("Info for t1: ");

        t1.ShowStyle();

        t1.ShowDim();

        Console.WriteLine("Area is " + t1.Area());

 

        Console.WriteLine();

 

        Console.WriteLine("Info for t2: ");

        t2.ShowStyle();

        t2.ShowDim();

        Console.WriteLine("Area is " + t2.Area());

    }

}

     Output
Info for t1:
Triangle is isosceles
Width and height are 4 and 4
Area is 8

Info for t2:
Triangle is right
Width and height are 8 and 12
Area is 48

 

3:  Draw a real picture for single level inheritance.
Perform following tasks.
Task 1: Create a class
Task 2: Add few data members as private, protected and public
Task 3: Add few methods as public to work on defined data members
Task 4: Create another applicable class which inherits members from above class
Task 5: Add few data members as private, protected and public into second class
Task 6: Add few methods as public to work on defined data members into second class
Task 7: Create a Demo class with main method.
Task 8: Create at least two objects of a second class defined in Task 4 into main method and call all methods using that object.
Task 9: Write comment for each important portion of code like data members’ declaration, methods, some important logic etc.
Task 10: Summarize above solution in your own few words to visualize the solution to the end user.

 

 

 

4 : From the following code and given output complete missing statements and find out error code and correct it.

using System;

namespace StaticVarApplication

{

    class StaticVar

    {

       public static int num;

 

        public counting()

        {

            num++;

        }

//………………………………Missing statement……………………………….//      

        {

            return num;

        }

    }

    class StaticTester

    {

        static void Main(string[] args)

        {

            StaticVar s = new StaticVar();

            s.count();

            s.count();

            s.count();                  

            Console.WriteLine("Variable num: {0}", StaticVar.getNum());

            Console.ReadKey();

        }

    }

}

Output:

Variable num: 3

 

5 :  Find out error code and correct it. Print appropriate output as desired.

using System;

public class A // This is the base class.

{

    public A(int value)

    {

     // Executes some code in the constructor.

     Console.WriteLine("Base constructor A()");

    }

}

 

public class B : A // This class derives from the previous class.

{

    public B(int value) : base(value)

    {

     // The base constructor is called first.

     // ... Then this code is executed.

     Console.WriteLine("Derived constructor B()");

    }

}

 

class Program

{

    static void Main()

    {

     // Create a new instance of class A, which is the base class.

     // ... Then create an instance of B, which executes the base constructor.

     A a = A(0);

     B b = B(1);

    }

}

 

6 :  Find out error code and correct it. Print appropriate output as desired.

Solution:

using System;

abstract class Test

{

    int a;

    abstract void A();

}

 

class Example1 : Test

{

    public override void A()

    {

     Console.WriteLine("Example1.A");

     base.a++;

    }

}

class Example2 : Test

{

    public override void A()

    {

     Console.WriteLine("Example2.A");

     base.a--;

    }

}

class Program

{

    static void Main()

    {

     // Reference Example1 through Test type.

     Test test1 = new Example1();

     test1.A();

     // Reference Example2 through Test type.

     Test test2 = new Example2();

     test2.A();

    }

}

 

7 :  Refer given output and find out error code and correct it.

sealed class A

{

        public int x;

        public int y;

}

class B : A

{

        public int z;

}

class SealedTest2

{

        static void Main()

        {

            A sc = new A();

            sc.x = 110;

            sc.y = 150;

            Console.WriteLine("x = {0}, y = {1}", sc.x, sc.y);

        }

}

Output

x = 110, y = 150

 

 

 

 

 

8 :  Find out error code and correct it. Print appropriate output as desired.

Solution:

   class X

    {

        protected virtual void F() { Console.WriteLine("X.F"); }

        protected virtual void F2() { Console.WriteLine("X.F2"); }

    }

    class Y : X

    {

        sealed protected override void F() { Console.WriteLine("Y.F"); }

        protected override void F2() { Console.WriteLine("Y.F2"); }

    }

    class Z : Y

    {

        // Overriding F

        protected override void F() { Console.WriteLine("Z.F"); }

 

        // Overriding F2

        protected override void F2() { Console.WriteLine("Z.F2"); }

    }

   class SealedMethodTest

   {

        static void Main()

        {

            X Obj1 = new X();

            Obj1.F();

            Obj2.F2();

 

            Y Obj2 = new Y();

            Obj2.F();

            Obj2.F2();

 

            Z Obj3 = new Z();      

            Obj3.F();

            Obj3.F2();

         }

   }

 

9 : This program will throw an exception. Add try, catch and finally blocks to handle this       exception.

 

using System;
class MyClient
{
      public static void Main()
      {
            int x = 0;
            int div = 100/x;
            Console.WriteLine(div);
       }
} 

          

10: Arrange the code to get desirable output

        
class MyException : Exception
{
}
class MyClient
{
    public static void Main()
    {
         try
         {
                 throw new MyException("my exception generated.");
         }
         catch(Exception e)
         {
                
         }
         Console.WriteLine("LAST STATEMENT");
    }

                using System;

                public MyException(string str)
    {
              Console.WriteLine("User defined exception");
              Console.WriteLine("Exception caught here: " + e.ToString());

                 }

}

           Output:

           Exception caught here: my exception generated.

           LAST STATEMENT