Question

QUESTION 3 (20)
Create a constructor class Sum that has public integer variables num1 and num2. Include a default constructor and a method Add that accepts the two integer parameters, calculates and outputs the sum. In your main class Calculate include a main method that prompts the user to enter 2 integer values and create a reference called total for the constructor Sum. Output the values entered by the user and the sum of the values in the command line window.

Answer 1

Explanation::

• Code in JAVA is given below
• Please read comments for better understanding of the code
• OUTPUT are given at the end of the code

Code in JAVA::

Sum.java ::

public class Sum{
   public int num1;
   public int num2;
   /**
   *Default Constructor that initializes
   */
   public Sum(){
       this.num1=0;
       this.num2=0;
   }
   public void Add(int n1,int n2){
       /**
       * Calculates the sum of n1 and n2
       * And then displays the value
       */
       int sum=n1+n2;
       System.out.println("The sum of "+n1+" and "+n2+" is "+sum);
   }
}

Calculate.java::

import java.util.*;
public class Calculate{
   public static void main(String[] args){
       /**
       * Using Scanner class object to take input
       * from the user
       */
       Scanner sc=new Scanner(System.in);
      
       /**
       * Two integer variables named n1 and n2
       * are created
       */
       int n1,n2;
      
       /**
       * Prompting user to enter two integers
       */
       System.out.print("Enter first number : ");
       n1=sc.nextInt();
      
       System.out.print("Enter second number : ");
       n2=sc.nextInt();
      
       Sum total=new Sum();
       total.Add(n1,n2);
      
   }
}

OUTPUT::

TEST CASE 1::
javac Calculate.java

java Calculate
Enter first number : 23
Enter second number : 20
The sum of 23 and 20 is 43

TEST CASE 2::
java Calculate
Enter first number : 67
Enter second number : 89
The sum of 67 and 89 is 156