Root. Power, And Pi - Sharp PC-1500 Instruction Manual

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B. Range of Calculations
Most machines have a
ral'lQ e
of numbers \..,ith which they can operate. in the PC· l 500, th is
range is any nurnbE>r between 9 .999999999 x 10 " 99 and - 9.999999999 x 10 " - 99. When a
number exceeds th is range it becomes too large f<>r the computer to handle and an " overflow''
condition {signalled
by
error 37 1 occurs. There is also an "underflow" condition; the point at
\¥h ich a number becomes too small . An underfloi,v condition w ill not be signall ed; no error
message or halt will occu r. Any number which f alls into the range of - 1 x 10 " - 99 to 1 x
10 " 99 w ill be regarded as zero. Th is is illustrated by the f ollowing chart:
- 1x10" - 99 1
x
10" - 99
-9.999999999
X
lQ
A
99 0
9.999999999 x 10 /\ 99
'
ERROR
COMPUTATIONAL REGAR DED COM PUTATIONAL ERROR
RANGE AS ZERO RANGE
Exampl e 1: If you t ry to sol ve the equation { 5.67 x 10 " 55} * (8.90 x 10 " 65}, you will
cause an overflow:
Keystrokes
Error 37 ind icates
c~lculat ion
overfloi.v.
C. Root, Power, Pi
Root
Ex~mple
1: To find the square root of 73 :
Keystrokes
Example
2:
To find
V2s6 :
Keystrokes
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62
Display
(5. 67E55)
*
(8. 90E65)_
~RROR .
37 _ _ _ _
Display
[! 73_
1 ~
___
8._ 5 _44003745 1
Display
lrr25s_