Differences from Minimal BASIC

The following modifications are needed for programs written in Minimal BASIC.
These are due to the incompatibilities between the Minimal BASIC standard and the Full BASIC standard.

1. When OPTION BASE is not written, option base is assumed to be 1 on Full BASIC while it is assumed to be 0 on Minimal BASIC.
   If arrays need indices 0, add
   `OPTION BASE 0`
   at the beginning.
2. Full BASIC demands all arrays to be declared.
   For all arrays not declared, add declarations such as
   DIM A(10),B(10),C(10)

Refer to Automated Correction