Logical Comparisons And Inequalities - Sharp PC-1500A Instruction Manual

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Input
Display
( ( 6 - 4)
I
2)
* ( ( (
3 - 1)
I
4)
*
6 ) IE:'llfAI
3
The equat ions with in the innermost
w.t
of pare ntheses will al\vays be calculated first.
REMEMBER : When in doubt. use pa rentheses to· c lar ify the o rder o f your arilhmetic operat ions.
G. LOGICAL COMPARISONS AND INEQUALITIES
SHARP will allow you to compare two 1Jal ues or eQuat ions and \viii indicate to you t he result o f
the comparison . T his abi lity is basic to designing programs which make d ecisions. The manner in
which lhis is done w il l be recogn izab le to stude nts of th@ .. N@w Math .. as an inequality (don' t
despair if you o, , · 1ere n't ra ised on Ne\v Math; the author \•Jasn't either).
An inequal ity may be though t of as a compa rison which is e ithe r true o r false. For instance,
the statement "six d ivided by three is equal to t\vo" is a comparison which happens to be true.
On t he other hand. the statement, " six divided by three is
greater than fi11e"
is a false comparisol).
Co1nputers and mathematic ians use the fo llo ..... ing symb ols for the possible types o f com·
parisons:
<
less th an
>
greater
tha"
=
equal to
<=
less th an OR equal t o
>=
greater than 0 R equal t o
<>
not equal to
Thus, we can re state tho above inequal ities symbolically. as: 6 { 3
=
2 a nd 6
I
3
>
5 respec·
t ively.
Given an inequality, SHARP will dete rrnine .. ..,hether the compariion is true or fa ls.e. In
keeping \Yith current com pute r d esign practice, SHARP will ind icate a tt ue staternent with a
t
and
a fa lse statemerl! w ith a
0.
For example if you type:
6 13 = 2
SHARP w ill respond w ith a 1 (for true). T yping the sequ ence:
6 I 3
>
5
will elicit a response of
0
(for false).
Try the follow ing t ests of SHARP's judgmen t (be sure you are in RUN mode) :
18
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