12 votes

The cyclomatic complexity of each of the modules A and B shown below is 10. What is the cyclomatic complexity of the sequential integration shown on the right hand side?

- 19
- 21
- 20
- 10

27 votes

Best answer

5 votes

Cyclomatic complexity of A=B=10

Number of decision points in A = 10 -1 = 9

Number of decision points in B = 10- 1 = 9

Cyclomatic Complexity of the integration = Number of decision points + 1 = (9 + 9) + 1 = 19

Answer must be **A**

1 vote

As we know their are several ways to find Cyclomatic complexity one of the is :

Cyclomatic complexity = Number of enclosed regions + 1

Here, +1 is because of count of external region

Therefore, Cyclomatic complexity of A is 10 (given) which means Number of enclosed regions + 1 external region

and Cyclomatic complexity of B is 10 (given) which means Number of enclosed regions + 1 external region

When we combine both the modules external region becomes same for both

Hence, 10 + 10 - 1 = 19

**Option (A) is correct.**