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60
Section 5: Floating-Point Numbers
Keystrokes
DEC
[x%)]
(J(wiNDOW] 1
Display
-88 d
73787526 .d
39 d.
Converts to Integer
mode. X-register
contains exponent of 2.
Mantissa.
Answer 1s (3973787526 X
2-88)10.
Example: The following key sequence shows that the conversion
of 1in Integer mode (1 + 2°= 1) to Floating Point mode and back to
Integer mode (80000000, X 2731) yields equivalent but different
representations of 1.
Keystrokes
HEX
1 [ENTER]
0
[f](FLOAT]4
HEX
(] SHOW [DEC]
[x2)]
Display
0 h
1.0000
FFFFFFE1 .h
-31 d
80000000 h
([STATUS]: 2-56-0000)
y=1. |y|is not an
integer such that
21 <y <2%
x=0.
() 29=1)@)=1.
Converts back to Integer
mode.
X = _3110.
y = 80000000, = 2%
y is now an integer such
that 23! <|y| < 2%? and
ye23l=1]
Other Effects of Converting to Integer Mode
When you switch out of Floating-Point Decimal mode into Integer
mode, the following conditions will exist:
e Word size remains 56 bits.
e The stack and storage registers are not cleared, although any
storage register values which were not entered in Integer mode
will be altered from their original meanings.*
e The complement mode does not change.
*Such values are retrievable in their original form when the calculator converts back to
Floating Point mode, assuming you have not changed the register contents.
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