HP HP-25 - Editing and Correcting Programs

Proar
ammir
JU rogrammit
around the following step, which can contain an unconditional
branch or a simpler instruction (I for example). The pro-
gram makes a decision for you!
Conditional Test
YES Program execution branches
around one step if the answer
to the testis NO.
The eight different conditionals in your HP-25 are shown here.
In each case, the tests are made on the 10-digit numbers and
two-digit exponents actually stored in the stack registers, not
on the displayed values.
QB tests to see if the value in the X-register is less than
the value in the Y-register.
tests to see if the value in the X-register is greater than
or equal to the value in the Y-register.
QB tests to see if the value in the X-register is not equal to
the value in the Y-register.
1] tests to see if the value in the X-register is equal to the
value in the Y-register.
9] tests to see if the value in the X-register is less than
Zero.
B8 tests to see if the value in the X-register is greater than
or equal to zero.
B8 tests to see if the value in the X-register is not equal
to zero.
B tests to see if the value in the X-register is equal to
Zero.
Example Program. This program calculates the arc sine of an
input value x (x must be within the limits of —1 and +1). The
program tests the resulting angle, and if it is not greater than
zero, adds 360 degrees to it. The angle displayed by the pro-
gram, then, is always positive.
To key in the program set the mode switch to PR GM o [ITHM =~
and press [l PrG Jto clear program memory and display step
00. Then key in the following list of keys.