TestRound.java

import java.util.Scanner;

class TestRound {

    /**
    *   Program:    TestRound.java
    *   Purpose:    Test cradle for Math.round() on decimal numbers.
    *   Creator:    Chris Clarke, author "50 Java Program Source Codes" and now
    *           "50 More Java Source Codes", both books available now from Amazon.
    *           Practical, working code = homework done in a jiffy!!!
    *   Created:    29.05.2014
    */

    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);
        double d = 0.0f;

        do {
            System.out.print("Enter decimal (like 2.5) to round (negative quits): ");
            d = in.nextDouble();

            if (d<0) break; // out of do..while

            // round to nearest int
            System.out.println( Math.round(d));
        } while (true);

    } // end main()

} // end class TestRound