HP HP-67 - Page 184

180 Branching
A instruction used this way is known as an unconditional branch.
It always branches execution from the instruction to the specified
label. (Later, you will see how a conditional instruction can be used in
conjunction with a instruction to create a conditional branch—a
branch that depends on the outcome of a test.)
A common use of a branch is to create a ‘‘loop’’ in a program. For
example, the following program calculates and displays the square
roots of consecutive whole numbers beginning with the number 1. The
HP-67 continues to compute the square root of the next consecutive
whole number until you press to stop program execution (or
until the calculator overflows).
To key in the program:
First, slide the Program Mode switch weram [Tl run to W/PRGM.
Press [ to clear program memory and reset the calculator to
step 000.
Press Display
omn
o —
|
07
®
1 Adds 1 to current number
in R;.
1 Recalls current number
from R;.
Q Displays current number.
o 009 31 54
o 070 35 72] Displays square root of
current number.
7 0711 22 07] Transfers execution to
Q 7 again.
0 012 35 22