HP HP-16C - Section 9: Program Branching and Controls; Indirect Branching Using the Index Register; Conditional Tests

86 Section 8: Program Editing
incorrect for the program being run, you will get incorrect results.
Therefore, it is wise to initialize the calculator—such as clear
registers and set relevant modes—either just prior to running a
program or within the program itself. Note that any status
condition set by a program will also affect any subsequent
programs.
Functions used to initialize conditions in the calculator are: the
“CLEAR" functions, the “SET COMPL" functions, the number base
modes, Floating-Point Decimal mode, [WSIZE], and [CF].