[Warnings] Fixed Minor Warnings

[AlexandreSinger]

Fixed a warning with a loop induction variable not being initialized.

Fixed a warning where a method overrides the base class, but was not explicitly declared as override.

Resolves #2831

[vaughnbetz]

@heshpdx @amin1377 : worth checking if this uninitialized variable also exists in the spec version of the code.

for (size_t kk; kk < N - 1; kk++) {

[heshpdx]

Yup, got it, thank you!