While Loop programs

Read the class notes on while loops (both pages). Read the section on break; continue;
Copy the program at the bottom of the while loop page 1 and run it.

Once you've done this, then ...

There are four programs to do:

The second page on while loops (course notes) shows 4 ways of making and exiting while loops.

All four of your programs will do this:

• Your program will get numbers (int) from the user. Do this in a while loop so that you keep getting more numbers.
• If the number is a multiple of 3 or 5, do nothing (use the "continue" command for this)
• If the number is -99 then exit the loop
• All other numbers should be added to the total (yes, you're making a total of all of the numbers)
• After you exit the while loop print out the total.

Here's the outline of how to do the first program (using while (true){ )

• make a scanner
• create a total variable
• start while loop: while (true) { }
  • get number from user (print something first)
  • if number is a multiple of 3 or 5 continue. Use if (num%3 == 0) continue;
  • if number is -99 then break;
  • add number to total
• end the loop }
• print out total

Example:

n	total
---------------
2	2
4	6
20	6	(multiples of 5 are ignored)
11	17
6	17	(multiples of 3 are ignored)
-99	17	(exit the loop)

Total = 17

4 programs: There are four ways of writing and exiting While loops

Write 4 programs, each using one of the following forms of the while loop, and each one doing the same logic with %3, %5 and -99.

1. using while(true) and exiting using break
2. using the condition in while(): while( ..... ) {
3. using a boolean that is checked in the while loop. Example: while(keepLooping) {
4. using a do while loop

You can call them While1.java, While2.java, While3.java and While4.java