HP (Hewlett-Packard) Calculator HP 12C Financial Calculator User Manual

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112 Section 8: Programming Basics
File name: hp 12c pt_user's guide_English_HDPMF123E27 Page: 112 of 275
Printed Date: 2005/8/1 Dimension: 14.8 cm x 21 cm
The 000 Instruction and Program Line 000
Whenever you run the program now stored in program memory, the calculator
executes the instruction in line 008 after executing the seven instructions you keyed
in. This
i
000 instruction — as its name implies — tells the calculator to “go to”
program line 000 and execute the instruction in that line. Although line 000 does
not contain a regular instruction, it does contain a “hidden” instruction that tells the
calculator to halt program execution. Thus, after each time the program is run, the
calculator automatically goes to program line 000 and halts, ready for you to key
in new data and run the program again. (The calculator is also automatically set to
program line 000 when you press
fs
to set the calculator from Program mode
to Run mode or when
f
CLEAR
Î
is pressed in run mode.)
The
i
000 instruction was already stored in line 008 — in fact, in all program
lines — before you keyed in the program. If no instructions have been keyed into
program memory, if Continuous Memory is reset, or if
f
CLEAR
Î
is pressed (in
Program mode), the instruction
i
000 is automatically stored in program lines
001 through 008. As you key each instruction into program memory, it replaces
the
i
000 instruction in that program line.
If your program should consist of exactly eight instructions, there would be no
i
000 instructions remaining at the end of program memory. Nevertheless, after
such a program is executed the calculator automatically returns to program line
000 and halts, just as if there were a
i
000 instruction following the program.
If you key in more than eight instructions, program memory automatically expands
to accommodate the additional instructions.
Expanding Program Memory
If no instructions have been keyed into program memory, if Continuous Memory
has been reset, or if
f
CLEAR
Î
has been pressed (in Program mode), program
memory consists of 8 program lines, and there are 20 storage registers available
for storage of data.

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