CS 1713/1711 Introduction to Computer Science Laboratory 7

CS 1711 Recitation Laboratory 7:
Loops [10/26/99; 10/28/99]

Objectives:

Add a method to an existing class.
Write a program with simple loops.
Use a previously developed class in a more complex program.
Use a nested loop.

This laboratory builds on the basic Frog class that can be found at http://vip.cs.utsa.edu/classes/cs1713f99/robbins/labs/Frog.html that was used as the starting point for Laboratory 5.

Check-off procedure:

You must attend the recitation and sign in. This laboratory will be checked of using the new procedures.

Laboratory details:

This lab uses the Frog class developed in Lecture and modified in Laboratory 5. You will NOT be using simple.IO in this laboratory. This lab involves the programming of a variation of the frog problem. In Exercise I, you will add a method to the Frog class and test it. In Exercise II you will use a loop to have a Frog object hop multiple times. In Exercise III you will instantiate two Frogs and look at the similarity in their statistics. In Exercise IV, you will use a nested loop to perform multiple trials.

Exercise I: Adding a method to the Frog class.

Create a standalone project called FrogExperimentI and add the Frog class (as a file called Frog.java) to the project. Build and run the project before proceeding.
Add the following method to the Frog class:
```
      public void PrintStatistics() {
     
      }
```
The PrintStatistics method should output the Frog's information in some reasonable way using System.out.println statements.
Add code to FrogExperimentI to test the method by instantiating a Frog, calling the Hop method a few times and then calling the PrintStatistics method to display the results.

Exercise II: Using a simple loop

Create a new project standalone project called FrogExperimentII and add the Frog class previously developed to this standalone project. Build and run the project before continuting.
Add code to FrogExperimentII to instantiate a Frog called Kirby.
Add code to ask Kirby to hop 100 times.
Output Kirby's statistics by calling the PrintStatistics method.

Exercise III: Kermit and Kirby hopping together

Create a new project standalone project called FrogExperimentIII and add the Frog class previously developed to this standalone project. Build and run the project before continuting.
Add code to the main program of FrogExperimentIII to instantiate two Frog objects, one named Kirby and one named Kermit.
Add code to ask Kirby and Kermit to hop 100 times and output the number of times that Kermit and Kirby land on the same lilly pad.
Output Kermit and Kirby's individual statistics by calling the PrintStatistics method for each of these objects.

Exercise IV: Doing more trials using a nested loop

Create a new project standalone project called FrogExperimentIV and add the Frog class previously developed to this standalone project. Build and run the project before continuing.
Add code to the main program of FrogExperimentIV that will perform 10 experimental trials. Each trial consists of the following:
- Instantiate a new version of Frog Kermit.
- Ask Kermit to hop 100 times.
- Update the accumulators necessary to calculate the average (over all of the trials) of the final position and average number of visits to the home pad.
- Update the greatest final positions reached in the positive and negative direction as needed.
Output the statistics for the 10 trials as follows:
- The average final position.
- The average number of visits to the home pad.
- The greatest final position reached in the positive direction.
- The greatest final position reached in the negative direction.

Last revision: October 19, 1999 at 9 am.