Java 6 Illuminated: An Active Learning Approach, 2nd Edition

The round Method

The round method converts a double to its nearest integer using these rules:

■

any factional part .0 to .4 is rounded down

■

any fractional part .5 and above is rounded up

Lines 9–13 in Example 3.15 use the round method with various numbers.

Figure 3.22 shows the output.

1 /* A demonstration of the Math round method

2 Anderson, Franceschi

3 */

4

5 public class MathRounding

6 {

7 public static void main( String [ ] args )

8 {

9 System.out.println( “23.4 rounded is “ + Math.round( 23.4 ));

10 System.out.println( “23.49 rounded is “ + Math.round( 23.49 ));

11 System.out.println( “23.5 rounded is “ + Math.round( 23.5 ));

12 System.out.println( ...