Java

OOP GUIDE / WORK

STEPTRACKER CLASS SOURCE

Source

• This question was part of the 2019 AP exam free response questions. You can find all four of the original questions here on the AP site.

Online Solution & Guide

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TASK – PART 1 – STEPTRACKER CLASS

Here is my solution:

public class StepTracker

{

private int totalSteps;

private int totalDays;

private int activeDays;

private int activeLimit;

public StepTracker(int activeLimit)

{

this.activeLimit = activeLimit;

totalSteps = 0;

totalDays = 0;

activeDays = 0;

}

public int activeDays()

{

return activeDays;

}

public double averageSteps()

{

if (totalDays == 0) //careful to avoid divide by 0 issue

return 0;

else //careful to avoid int division

return (double)totalSteps / totalDays;

}

public void addDailySteps(int steps)

{

totalSteps += steps;

totalDays++;

if (steps >= activeLimit)

activeDays++;

}

}

TASK – PART 2 – TESTING THE STEPTRACKER CLASS

No solution required.