90
Section 8
Program Branching
and Controls
Although the instructions in a program are normally executed
sequentially, it is often desirable to transfer execution to a part of the
program other than the next line. Branching in the HP 15c may be simple,
or it may depend on a certain condition. By branching to a previous line, it
is possible to execute part of a program more than once—a process called
looping.
The Mechanics
Branching
The Go To (t)
Instruction. Simple branching—that is, unconditional
branching—is carried out with the instruction t label. In a running
program, t will transfer execution to the next appropriately labeled
program or routine (not to a line number).
015-t 7
016-
017-
018-
019-´ b 7
020-
The calculator searches forward in memory, wrapping around through
line 000 if necessary, and resumes execution at the first line containing
the proper label.
Looping. If a t instruction specifies a label at a lower-numbered line
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