Java Examples
Dave Braunschweig
Counting
// This program demonstrates While, Do, and For loop counting using // user-designated start, stop, and increment values. // // References: // https://en.wikibooks.org/wiki/Java_Programming import java.util.*; public class Main { private static Scanner input = new Scanner(System.in); public static void main(String[] args) { int start = getValue("starting"); int stop = getValue("ending"); int increment = getValue("increment"); demonstrateWhileLoop(start, stop, increment); demonstrateDoLoop(start, stop, increment); demonstrateForLoop(start, stop, increment); } public static int getValue(String name) { System.out.println("Enter " + name + " value:"); int value = input.nextInt(); return value; } public static void demonstrateWhileLoop(int start, int stop, int increment) { System.out.println("While loop counting from " + start + " to " + stop + " by " + increment + ":"); int count = start; while (count <= stop) { System.out.println(count); count = count + increment; } } public static void demonstrateDoLoop(int start, int stop, int increment) { System.out.println("Do loop counting from " + start + " to " + stop + " by " + increment + ":"); int count = start; do { System.out.println(count); count = count + increment; } while (count <= stop); } public static void demonstrateForLoop(int start, int stop, int increment) { System.out.println("For loop counting from " + start + " to " + stop + " by " + increment + ":"); for (int count = start; count <= stop; count += increment) { System.out.println(count); } } }
Output
Enter starting value: 1 Enter ending value: 3 Enter increment value: 1 While loop counting from 1 to 3 by 1: 1 2 3 Do loop counting from 1 to 3 by 1: 1 2 3 For loop counting from 1 to 3 by 1: 1 2 3