Answer:
// Scanner class is imported to receive user input
import java.util.Scanner;
// class Solution is defined
public class Solution{
// recursive function to calculate
// multiplication of two numbers
// the second number is initialised to 3
// it return the product
public static int product(int x, int y)
{
// first it check if 3 is not 0
// then it uses repetitive addition to get the product
// it continues till 3 becomes 0
if (y != 0)
return (x + product(x, y - 1));
}
// main method to begin program execution
public static void main (String[] args)
{
// Scanner object scan is initialize to receive input
// via keyboard
Scanner scan = new Scanner(System.in);
// prompt is display to user to enter number
System.out.println("Enter your number to multiply: ");
// user input is assigned to x
int x = scan.nextInt();
// 3 is assigned to y which specify the number of times to multiply
int y = 3;
// while loop that continue to receive user input as long as it is not -1
while(x != -1){
// The result of the product is displayed
System.out.println(product(x, y));
// prompt is display to user to enter number
System.out.println("Enter your number to multiply: ");
// user input is assigned to x
x = scan.nextInt();
}
}
}
Explanation:
The program is written in Java. An image of program output when the code is executed is attached.
A Scanner class is imported that allow program to read input. Then the product method is defined that compute the product of a number3 times using repetitive addition.
Then the method product is called inside the main method where the user is asked to continue input a number as long as the sentinel value (-1) is not entered.
