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

6.9 Programming Activity 1: Using while Loops 327

if ( number < 1 || number > 10 ) // INCORRECT!

{

System.out.print( “Enter a number between 1 and 10 > “ );

number = scan.nextInt( );

}

The problem with this approach is that the if statement will reprompt the

user only once. If the user enters an invalid value a second time, the pro-

gram will not catch it. A do/while loop, however, will continue to reprompt

the user as many times as needed until the user enters a valid value.

6.9 Programming Activity 1: Using while Loops

In this activity, you will work with a sentinel-controlled while loop, per-

forming this activity:

Write a while loop to process the cont ...