CSC307 Lecture 14

Introduction to Software Engineering
Software Metrics
(202307)

Transcript

1. jgs CSC 307 Introduction to Software Engineering Lecture 14: Software Metrics Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.com Building 14 -227 Office Hours: By appointment
2. jgs Metrics
3. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 4 Metrics Size LOC eLOC lLOC Complexity Average, Max, Min LOC Cyclomatic Complexity Software Metrics
4. jgs Software Metrics Size
5. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 6 § LOC – Lines of Code Metric. Including lines of a single brace or parenthesis § LOC are used to create time and cost estimates. § LOC are a tracking tool to measure the degree of progress on a module or project. § An experienced developer can gage a LOC estimate based upon knowledge of past productivity on projects. Size Metrics
6. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 7 § eLOC – effective Lines of Code Metric. Only code statements § An effective line of code or eLOC is the measurement of all lines that are not comments, blanks or standalone braces or parenthesis. These can inflate LOC metrics by 20 to 40 percent. § This metric more closely represents the quantity of work performed. Size Metrics
7. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 8 § lLOC – logical Lines of Code Metric. § These statements are terminated with a semi-colon. § The control line for the "for" loop contain two semi-colons but accounts for only one semi colon. Size Metrics
8. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 9 Example
9. jgs Test Yourselves
10. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 11 Hello World
11. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 12 BubbleSort Iterativo
12. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 13 Recursive BubbleSort
13. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 14 In Order Traversal
14. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 15
15. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 16
16. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 17
17. jgs Software Metrics Complexity
18. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 19 § Cyclomatic Complexity. It is a quantitative measure of the number of linearly independent paths. § Paths occur when "while,” "for,” "if,” "case," and "goto" keywords appear within the function. § If the source code contained no control flow statements (conditionals or decision points), the complexity would be 1 § If the code had one single-condition IF statement, there would be two paths through the code: one where the IF statement evaluates to TRUE and another one where it considers to be FALSE. § Two nested single-condition IFs, or one block with two conditions, would produce a complexity of 3. Function Metrics
19. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 20 Cyclomatic Complexity CC = Edge - Node + 2 Or CC = ConditionalNodes + 1
20. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 21 i = 0; n=4; while (i<n-1) { j = i + 1; while (j<n) { if (A[i]<A[j]) swap(A[i], A[j]); } i=i+1; } // CC = 9 - 7 + 2 = 4 // CC = 3 + 1 = 4 (Condition nodes are 1,2 and 3 nodes) // A set of possible execution path of a program // 1, 7 // 1, 2, 6, 1, 7 // 1, 2, 3, 4, 5, 2, 6, 1, 7 // 1, 2, 3, 5, 2, 6, 1, 7 Cyclomatic Complexity
21. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 22 Complexity Number Meaning 1-10 Structured and well written code High Testability Cost and Effort is less 10-20 Complex Code Medium Testability Cost and effort is Medium 20-40 Very complex Code Low Testability Cost and Effort are high >40 Not at all testable Very high Cost and Effort Cyclomatic Complexity
22. jgs Compare
23. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 24 Example Sprint 2
24. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 25 Example Sprint 3
25. jgs New Tool RSM
26. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 27 Resource Standard Metrics (RSM) is a source code metrics and quality analysis tool for ANSI C, ANSI C++, C# and Java for use on all Windows* and UNIX operating systems. 1. Download RSM 7.75 Trial (Windows) here: http://msquaredtechnologies.com/ RSM-Download.html * Install the Windows version. It includes a easy to use friendly interface (RSM Wizard). Tool
27. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 28 2. Review the user manual here http://msquaredtechnologies.com /m2wizard/RSM_Wizard_Manual.htm Disclaimer: It is a FREE tool… Issues counting LOCs, eLOCs, Issues counting conditions (syntaxis analysis) BUT ±0..9 does not affect in biggest projects 🧐 Resource Standard Metrics
28. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 29 Resource Standard Metrics
29. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 30 Resource Standard Metrics
30. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 31 Example Sprint 2
31. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 33 Questions
32. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 34 Office Hours Tuesday and Thursday 3 - 5 pm But an appointment required Sent me an email – javiergs@calpoly.edu
33. jgs
34. jgs CSC 307 Introduction to Software Engineering Lab 14: Software Metrics Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.com Building 14 -227 Office Hours: By appointment
35. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 37 Think about this Calculate metrics for your Shape App and Cluster App
36. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2023 | 38 Let’s Work
37. jgs CSC 307 Introduction to Software Engineering Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Summer 2023 Copyright. These slides can only be used as study material for the class CSC308 at Cal Poly. They cannot be distributed or used for another purpose.