# Step Tracker

This question involves the implementation of a fitness tracking system that is represented by StepTracker class. 

A StepTracker object is created with a parameter that defines the minimum number of steps that must be taken for a day to be considered active. The StepTracker class provides a constructor and the following methods.

* addDailySteps, which accumulates information about steps, in readings taken once per day •
* activeDays, which returns the number of active days 
* averageSteps, which returns the average number of steps per day, calculated by dividing the total number of steps taken by the number of days tracked.

The following table contains a sample code execution sequence and the corresponding results.

| Statements                                 | Expressions Value Returned | Comment                                                                                       |
| ------------------------------------------ | -------------------------- | --------------------------------------------------------------------------------------------- |
| `StepTracker tr = new StepTracker(10000);` |                            | Days with at least 10,000 steps are considered active. Assume that the parameter is positive. |
| `tr.activeDays();`                         | 0                          | No data have been recorded yet.                                                               |
| `tr.averageSteps();`                       | 0.0                        | When no step data have been recorded, the averageSteps method returns 0.0.                    |
| `tr.addDailySteps(9000);`                  |                            | This is too few steps for the day to be considered active.                                    |
| `tr.addDailySteps(5000);`                  |                            | This is too few steps for the day to be considered active.                                    |
| `tr.activeDays();`                         | 0                          | No day had at least 10,000 steps.                                                             |
| `tr.averageSteps();`                       | 7000.0                     | The average number of steps per day is (14000 / 2).                                           |
| `tr.addDailySteps(13000);`                 |                            | This represents an active day.                                                                |
| `tr.activeDays();`                         | 1                          | Of the three days for which step data were entered, one day had at least 10,000 steps.        |
| `tr.averageSteps();`                       | 9000.0                     | The average number of steps per day is (27000 / 3).                                           |
| `tr.addDailySteps(23000);`                 |                            | This represents an active day.                                                                |
| `tr.addDailySteps(1111);`                  |                            | This is too few steps for the day to be considered active.                                    |
| `tr.activeDays();`                         | 2                          | Of the five days for which step data were entered, two days had at least 10,000 steps.        |
| `tr.averageSteps();`                       | 10222.2                    | The average number of steps per day is (51111 / 5).                                           |