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Subgoals

Section 7.3 Worked Example: For 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 7.3.1

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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total = 0;
for (int x = 5; x < 50; x++)
{
  if (x % 5 == 0)
     total += x;
}
System.out.println(total);
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Subsection 7.3.2 SG1: Diagram which statements go together.

Figure 7.3.1.
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Subsection 7.3.3 SG2: Define and initialize variables

Start:
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x = 5
total = 0
End:
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x >= 50
Figure 7.3.2.
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Subsection 7.3.4 SG3: Trace the loop

Figure 7.3.3.
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Figure 7.3.4.
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X increments by 1, but the value is only added to total when it is evenly divisible by 5.
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Notice that this example gives the equivalent for loop for the while loop in 6.1.
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Answer.
Output is 225
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Practice Pages.

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