The ABC software metric was introduced by Jerry Fitzpatrick in 1997 to overcome the drawbacks of the LOC.[1]
The metric defines an ABC score as a triplet of values that represent the size of a set of source code statements. An ABC score is calculated by counting the number of assignments (A), number of branches (B), and number of conditionals (C) in a program. ABC score can be applied to individual methods, functions, classes, modules or files within a program.
ABC score is represented by a 3-D vector < Assignments (A), Branches (B), Conditionals (C) >. It can also be represented as a scalar value, which is the magnitude of the vector < Assignments (A), Branches (B), Conditionals (C) >, and is calculated as follows:
By convention, an ABC magnitude value is rounded to the nearest tenth.
^Fitzpatrick, Jerry (1997). "Applying the ABC metric to C, C++ and Java" (PDF). C++ Report.
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