Zimmer/Porter CSCI130 Fall Lab 6 Selection. 1. Begin by copying the file from my directory into your account (name it lab6.

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Cameron Richard
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1 Zimmer/Porter CSCI130 Fall 2018 Lab 6 Selection Complete the following activities: 1. Begin by copying the file from my directory into your account (name it lab6.cpp): cp ~aporter/labs/lab6.cpp lab6.cpp 2. Review the revised design of the program created in lab3 (average of 5 test scores). The revised problem is to calculate the average of the values read from an input data file. 3. Create an input file named lab6.in with 5 scores in it: 10, 20, 30, 40,50 4. Compile, link and run the program. How would you test a different set of test scores? Is there are more flexible solution that would make testing easier? 5. Modify the design to let the user determine the input file to be used. Implement the solution. 6. Compile, link and run the program. Does this make it easier to test the program? 7. Modify the design to include only positive test scores in the calculated average. Make sure you do not end up with a program that will abort due to a runtime error! Implement the solution. 8. Compile, link and run the program. How can you test this solution? What are the test cases? 9. Modify the design to include only positive test scores less than or equal to 100. Implement the solution. 10. Compile, link and run the program. How can you test this solution? What are the test cases? 1

2 IDENTIFIER DICTIONARY: Identifier Const/var/function Data Type Value Description score1 var int first test score score2 var int second test score score3 var int third test score score4 var int fourth test score score5 var int fifth test score NUM_SCORES const int 5 number of test scores INPUT_FILENAME const string lab6.in name of file used for input score var int score read from the file avg var float calculated average of the test scores fin var ifstream input filestream variable GetScoreFromFile function int read a score from the open filestream CalcAvg function float calculate the average of the test scores OutputAvg function void Print the average of the test scores 2

3 Structure Chart (Show interface information): main fin score fin GetScoreFromFile score1 score2 score3 score4 score5 avg avg CalcAvg OutputAvg Function: main( ) Narrative: The program calculates the average of 5 test scores. Open the input file lab6.in as fin GetScoreFromFile(fin) GetScoreFromFile(fin) GetScoreFromFile(fin) GetScoreFromFile(fin) GetScoreFromFile(fin) Close the input file fin avg = CalcAvg(score1, score2,score3,score4,score5) OutputAvg(avg) end algorithm 3

4 Function: int GetScoreFromFile (ifstream & fin) Narrative: Read a single test score from the open input file stream Pre-condition: the input filestream is open Post-condition: a score is returned Read score from fin return score Function: float CalcAvg(int score1, int score2, int score3, int score4, int score5) Narrative: Calculates the average of the test scores Pre-condition: 5 test scores are sent into the function Post-condition: the floating point average is calculated avg = (score1 + score2 + score3 +score4+score5)/float(num_scores) return avg Function: void OutputAvg(float avg) Narrative: Prints the average of the test scores to the screen Pre-condition: the average is sent into the function Post-condition: the average is printed to the screen Output The average of the test scores is Output avg Output several end lines return 4

5 Test Plan identify significant test cases for the program. Key Purpose of Test (testing valid input or testing invalid input) T1 T2 T3 T4 T5 T6 T7 valid input all scores are counted valid input all scores are counted Test Case (specifically what input is being tested) all scores >0 all scores >0 and calculated avg is not whole number (below.5) Value used to Test (what actual values will be input) Expected Outcome (What output is generated or what should the program do with the data values entered) The average is 30.0 The average is

6 T8 6

Sonoma State University Computer Science Department CS 115 Fall 2010 Watts. Project 3 Part 1

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