How is Cyclomatic Complexity calculated?

Cyclomatic complexity in CodeScan is calculated by the number of decision points in a method.

For example, the below method would have a cyclomatic complexity of 5.

public void newMethod() {
     for(Integer i = 0; i < 100; i++){
      if (a == b && b == c){
      } else if(a != b) {

This counts:

  • The entry to the method

  • The entry to the for loop

  • The if statement and the first conditional

  • The second conditional in the if statement

  • The elseif statement

This does not include:

  • else statements

  • when else in switch statements

The cyclomatic complexity for a class will be the average complexity between all methods in that class.

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