Write a program (in Java) that prompts the user to input an integer. Try to find

Question

Write a program (in Java) that prompts the user to input an integer. Try to find a divisor for this integer, if there are no divisors the integer is a prime number, otherwise it is not a prime number.

Given Code:

import java.util.Scanner;

public class Lab5Part3 {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

int num;

int divisor;

System.out.println("Enter an integer greater than 1");

num = input.nextInt();

divisor = num / 2;

while (num % divisor != 0) {

System.out.println("Trying factor " + divisor);

divisor--;

}

if (divisor == 1) {

System.out.print("The input integer " + num + " is a prime number");

} else {

System.out.print("The input integer " + num + " is divisible by " + divisor);

}

}

Answer these questions:

1. What is the loop control variable?
2. What statement initializes the loop control variable?
3. What is the loop condition?
4. What statement updates the loop control variable?

Explanation / Answer

1. What is the loop control variable?

sol: The loop used in the abive program is while loop

The variable which is controlling it is "int divisor;"

2. What statement initializes the loop control variable?

sol: the intialization statement of the loop control variable divisor is "divisor = num / 2;"

3. What is the loop condition?

sol: the while loop condition is "(num % divisor != 0) "

4. What statement updates the loop control variable?

sol: "divisor--;" is the statement which updates the loop control variable

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