HP 35s User Manual

Programming Techniques 14-1
14
Programming Techniques
Chapter 13 covered the basics of programming. This chapter explores more
sophisticated but useful techniques:
 Using subroutines to simplify programs by separating and labeling portions
of the program that are dedicated to particular tasks. The use of subroutines
also shortens a program that must perform a series of steps more than once.
 Using conditional instructions (comparisons and flags) to determine which
instructions or subroutines should be used.
 Using loops with counters to execute a set of instructions a certain number of
times.
 Using indirect addressing to access different variables using the same
program instruction.
Routines in Programs
A program is composed of one or more routines. A routine is a functional unit that
accomplishes something specific. Complicated programs need routines to group
and separate tasks. This makes a program easier to write, read, understand, and
alter.
A routine typically starts at a label and ends with an instruction that stops program/
routing execution such as RTN or STOP.
Calling Subroutines (XEQ, RTN)
A subroutine is a routine that is called from (executed by) another routine and
returns to that same routine when the subroutine is finished.

HP 35s Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Black
Digits	14 digits
Display number of lines	2 lines
Keyboard type	Alphanumeric
Menus and prompts	Yes

Weight and Dimensions

Dimensions (WxDxH)	157.9 x 18 x 82 mm