Tests
of
Comparison
(TESTS)
There are eight comparisons available for programming in the
TESTS
menu. Pressing Hi
tests
I displays the two categories of tests:
xfy
X?0
For
tests
comparing x and y.
or
tests
comparing
x
and
0.
Remember that x refers to the number in the
X-register,
and y refers
to the numberin the
Y-register.
These
do
not
compare
the
variables
X
and
Y.
Select
the
category
of
comparison,
then
press
the menu key for the
conditional instruction you want:
The
TESTS
Menu
Keys
{*?>"}
{*?0}
{*y}
for x*y*>
{*0}
for
x*0?
{<y}
for
x<y?
{<©}
for
*<0?
{>y}
for
x>y?
{>0}
for
x>0?
{-y}
for
x=y?
{=0}
for
x=0?
Although
you
can
display
these
menus
outside
of
program
entry,
these functions have no purpose outside of programs.
For Example: The 'Quadratic Equation" program on page 191 in
part
4
uses
the
x=0?
and
x<0?
conditionals
in
routine
Q.
Q01
LBL
Q
Q02
INPUT
fl
Q03
x=0?
Q04
GTO
Q
Q05
INPUT
B
Checks the validity of A, which cannot be
zero.
If A = 0,
then
the
program starts over.
If A
¥*
0,
then
the program continues.
96
6:
Programming
Techniques
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