Using do...while Loop Structure

Submitted by GeePee on Wednesday, May 20, 2015 - 21:43.

The following Java program is a do…while Loop structure. In Java, do is a reserved word. As with the other repetition structures, a do…while statement can be either a simple or compound statement. If it is compound statement, enclose it between curly brackets. The expression is called loop condition. I will be using the JCreator IDE in developing the program. To start in this tutorial, first open the JCreator IDE, click new and paste the following code:

import java.util.*;
 
public class doWhile
{
        static Scanner console = new Scanner(System.in);
        
        public static void main (String[] args)
        {
                int num, temp, sum;
                
                System.out.print("Enter a positive integer: ");
                num = console.nextInt();
                System.out.println();
                
                temp = num;
                
                sum = 0;
                
                do
                {
                        sum = sum + num % 10;
                        
                        num = num / 10;
                        
                } while (num > 0);
                
                        System.out.println("The sum of the digits = " + sum);
                
                if (sum % 3 == 0)
                        System.out.println(temp + " is divisble by 3");
                else 
                                System.out.println(temp + " is not divisble by 3");     
                if (sum % 3 == 0)
                                                
                                System.out.println(temp + " is divisble by 9"); 
                else
                                System.out.println(temp + " is not divisble by 9");
        
        }
}

Sample run:


Enter a positive integer: 320

The sum of the digits = 5
320 is not divisble by 3
320 is not divisble by 9

This program works as follows: The statement System.out.print("Enter a positive integer: "); prompts the user to enter a positive integer. The statement num = console.nextInt(); store the next number in the variable num. The statement temp = num; temp is equals to variable num. The statement sum = 0; sets the value of variable sum to 0. The statement sum = sum + num % 10; extracts the last digit and add it to sum. The statement num = num / 10; remove the last digit. The statement

 do
                {
                        sum = sum + num % 10;
                        
                        num = num / 10;
                        
                } while (num > 0);<java> is the beginning and the end of the do..while loop.

The statements

 if (sum % 3 == 0)
                        System.out.println(temp + " is divisble by 3");
                else 
                                System.out.println(temp + " is not divisble by 3");     
                if (sum % 3 == 0)
                                                
                                System.out.println(temp + " is divisble by 9"); 
                else
                                System.out.println(temp + " is not divisble by 9");

Is the if…else condition where outputs the program if it is divisible by 3 or not, and divisible by 9 or not.

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