Unreferenced variable

An unreferenced variable in a computer program is a variable that is declared but which is never used. This usually results in a harmless waste of memory and may provoke a warning from the language's compiler or runtime system.

Examples

C:

int main() {
  int i, j;
  for (i=0; i<10; i++) printf("%d", i);
  return 0;
}

In this, {{{j}}} is an unreferenced variable.