Answer:

' First ask the user for how many numbers are going to be added.
' Then ask the user for each number, one by one.
' Add them up, print the sum.
'
PRINT "How many numbers are to be added"
INPUT HOWMANY
LET SUM = 0
LET COUNT = 1
'
DO WHILE COUNT <=  HOWMANY
  PRINT "Enter a number"       
  INPUT NUMBER                 
  LET SUM = SUM + NUMBER    
  LET COUNT = COUNT + 1
LOOP
PRINT "The sum is", SUM
END

Balloon Program

The program illustrates many ideas:

Asking the user how many times a loop should execute.
Starting SUM and COUNT out correctly.
Using DO WHILE to control the loop.
Each time the loop body executes, progress is made in computing the sum.
Printing out the final answer.

After all of that, you may wish to relax and go to a party!! You can be in charge of the balloons.

Say that you wanted do draw 10 red balloons on the graphics screen. For now let's draw 10 red circles and forget about the balloons' string. The command

CIRCLE (centerX, centerY), radius

draws a circle with the current pen color. The center of the circle is at (centerX, centerY) and it has the specified radius. To set the pen color to red use:

COLOR 4

This command is like picking up a red pen. The pen will stay red until another COLOR command changes it. (You are not expected to remember color numbers. Look in Chapter 5 if you want to see the list.)

Answer:

Balloon Program

QUESTION 15: