Section 5.3 Worked Example: For Loops - Counter
Subgoals for Evaluating a Loop.
- Diagram which statements go together.
-
Define and initialize variables
- Determine the start condition.
- Determine the update condition.
- Determine the termination condition.
- Determine body that is repeated.
-
Trace the loop.
- For every iteration of the loop, write down the values.
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Problem: Given the following code, what is the output?
total = 0;
for (int x = 5; x < 50; x++)
{
if (x % 5 == 0)
total += x;
}
System.out.println(total);
Subsection 5.3.1 SG1: Diagram which statements go together.
Subsection 5.3.2 SG2: Define and initialize variables
Start:
x = 0
total = 0
End:
x >= 50
Subsection 5.3.3 SG3: Trace the loop
X increments by 1 But only when it is evenly divisible by 5 is the value added to total
Output is 225
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