Question

Give the prototype (only) for the following functions:

1. a method called calculateDifference that takes two integers and returns the difference from subtracting the first argument from the second argument.

2. a method called displayIntroduction that takes no argument and simply prints “welcome”.

       

       

Answer 1

import java.util.Scanner;

public class SimpleClass {
  
   //method takes 2 argument and calculate the difference
   int calculateDifference(int i, int j)
   {
       int df;
       df = j - i;
       return df;
   }
  
   //method just print welcome
   void displayIntroduction()
   {
       System.out.println("welcome");
   }

   public static void main(String[] args)
   {
  
       SimpleClass object = new SimpleClass();
          //print welcome, you can print it anywhere. I keep it in the top
       object.displayIntroduction();
      
       //get 2 arguments
   Scanner sc = new Scanner(System.in);
   System.out.println("Enter first argument:");
   int i = sc.nextInt();
  
   System.out.println("Enter second argument:");
   int j = sc.nextInt();
  
   //call the method to find out subtraction
   int diff = object.calculateDifference(i,j );
   System.out.println("Diffrence between integer " + j + " and " + i + " is = " +diff);  
  
   sc.close();
   }
}