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Subgoals

Section 7.1 Worked Example: While Loops - Counter

Subgoals for Evaluating a Loop.

  1. Identify loop parts
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    1. Determine start condition
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    2. Determine update condition
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    3. Determine termination condition
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    4. Determine body that is repeated
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  2. Trace the loop
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    1. For every iteration of loop, write down values
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Subsection 7.1.1

You can watch this video or read through the content below it.
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Problem: Given the following code, what is the output?
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int counter = 0;
int total = 0;

while (counter < 50)
{
    if (counter % 5 == 0)
            total += counter;
    counter++;
 }

 System.out.println(total);
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Subsection 7.1.2 SG1: Diagram which statements go together.

Figure 7.1.1.
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Subsection 7.1.3 SG2: Define and initialize variables

Start:
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counter = 0;
total = 0;
End:
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counter >= 50
Figure 7.1.2.
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Subsection 7.1.4 SG3: Trace the loop

Figure 7.1.3.
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System.out.println(total);
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Figure 7.1.4.
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  1. For every iteration of loop, write down values
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Counter increments by 1, but the value is only added to total when it is evenly divisible by 5.
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Figure 7.1.5.
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Figure 7.1.6.
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Answer.
Output is 225
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Practice Pages.

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