CWE-563: Assignment to Variable without Use ('Unused Variable')
Weakness ID: 563
The variable's value is assigned but never used, making it a dead store.
After the assignment, the variable is either assigned another value or goes out of scope. It is likely that the variable is simply vestigial, but it is also possible that the unused variable points out a bug.
Time of Introduction
Technical Impact: Quality degradation; Varies by context
This weakness could be an indication of a bug in the program or a
deprecated variable that was not removed and is an indication of poor
quality. This could lead to further bugs and the introduction of
The following code excerpt assigns to the variable r and then
overwrites the value without using it.