Behavior of the program

(Display Listing 3.)

The behavior of this program is the same as the behavior of the program named Alice0175b except:

The values displayed in the bubble shown in Figure 4 are 0.0, 2.0, 4.0, etc. instead of 0.0, 1.0, 2.0, etc.

In other words:

• The earlier counting loop counts by ones.
• This counter loop counts by twos.

The loop can be made to count by any value you choose, (including fractional and negative values), by changing the specified value in the counter update clause.