Question

1. Complete the following Java program to, using BigDecimal, calculate and display the radius of the circle whose diameter is stored in the variable diameter.  The radius is calculated as half of the diameter. For example, since diameter is 7.5, the program should calculate and display the radius like this:  (2 points)   (CLO 1)

package q1; import java.math.BigDecimal; public class Q1 {     public static void main(String[] args) {         float diameter=7.5f;                        } }

                                            Radius = 3.75

2. Consider the following Java program and then answer the questions that follow.  (CLO 4)

Output:

public class TestInheritance{

            public static void main(String args[]){  

            Dog d=new Dog();

            d.eat();    

            d.bark();  

           }

  }

class Animal{  

    void eat()  {System.out.print("eating...");}  

}  

  class Dog __________ Animal {  

        void bark()  {System.out.println("barking...");}  

        void eat() {

              super.eat();

              System.out.println("only dog food");

         }

  }  

  

  

4.1 Fill in the missing keyword in the class Dog declaration to make it a subclass of   Animal.  (0.5 points)

4.2 In the box provided above, show the output of the program. (2 points)

3. Consider the earnings method of the subclass BasePlusCommissionEmployee, given below, then answer the question that follows:  (2.5 points)  (CLO 4)

  public double earnings()

   {

      return getBaseSalary() + Super.earnings();

   }    

  Find and fix the syntax error that is likely to be generated in the above method.

Answer 1

package q1;

import java.util.*;
import java.math.BigDecimal;

public class Main
{
   public static void main(String[] args) {
  
   Scanner sc=new Scanner(System.in);
   BigDecimal diameter = sc.nextBigDecimal();//taking input diameter from user
   BigDecimal conv = BigDecimal.valueOf(2);//converting the value 2 to BigDecimal because radius=diameter/2
   BigDecimal radius=diameter.divide(conv);// this will divide diameter by 2
System.out.println(radius); //print the radius
   }
}

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4.1

public class TestInheritance{

            public static void main(String args[]){  

            Dog d=new Dog();

            d.eat();    

            d.bark();  

           }

  }

class Animal{  

    void eat()  {System.out.print("eating...");}  

}  

  class Dog extends Animal {  

        void bark()  {System.out.println("barking...");}  

        void eat() {

              super.eat();

              System.out.println("only dog food");

         }

  }  4.2 The output of the

above program is

eating...only dog food

barking...

=================  

@Override
public double earnings() {
return getBaseSalary() + super.earnings();
}