The Cyclomatic complexity of two modules A and B are 10 and 15 respectively :

What is the cyclomatic complexity of sequential integration of A and B ?

The correct answer is Option 1: 19.

Key Points

• Cyclomatic complexity is a software metric used to measure the complexity of a program.
• It is calculated by using the control flow graph of the program, where nodes represent processing tasks and edges represent control flow between the nodes.
• The formula to calculate cyclomatic complexity is:
  M = E - N + 2P
  where M is the cyclomatic complexity, E is the number of edges, N is the number of nodes, and P is the number of connected components (usually 1 for a single program).
• When integrating two modules sequentially, the cyclomatic complexity of the combined module is the sum of the individual complexities.
• For modules A and B with cyclomatic complexities 10 and 15 respectively, the combined complexity is:
  10 + 15 - 1*2 + 2 = 19
  Subtracting the duplicate edge (1) and adding 2 for the single connected component.

Additional Information

• Cyclomatic complexity is used to gauge the complexity of a program and to identify areas that may require more thorough testing or refactoring.
• Higher cyclomatic complexity indicates a more complex program, which might be harder to understand, maintain, and test.
• Tools like McCabe IQ, SonarQube, and others can automatically calculate cyclomatic complexity for various programming languages.
• Reducing cyclomatic complexity can lead to more maintainable and reliable code.