Cyclomatic Complexity

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What is Cyclomatic Complexity?

Cyclomatic complexity is a source code complexity measurement that is being correlated to a number of coding errors. It is calculated by developing a Control Flow Graph of the code that measures the number of linearly-independent paths through a program module.

Lower the Program's cyclomatic complexity, lower the risk to modify and easier to understand. It can be represented using the below formula:

Cyclomatic complexity = E - N + P 
where,
  E = number of edges in the flow graph.
  N = number of nodes in the flow graph.
  P = number of nodes that have exit points

Example :

IF A = 10 THEN 
 IF B > C THEN 
   A = B
 ELSE
   A = C
 ENDIF
ENDIF
Print A
Print B
Print C

FlowGraph:

Cyclomatic complexity in Test Life Cycle

The Cyclomatic complexity is calculated using the above control flow diagram that shows seven nodes(shapes) and eight edges (lines), hence the cyclomatic complexity is 8 - 7 + 2 = 3



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