Campbell CR6 Series, Руководство оператора

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Section 7. Installation
223
Conversion of FLOAT / LONG to Boolean
'This program example demonstrates conversion of Float and Long data types to Boolean
'data type.
Public Fa As Float
Public Fb As Float
Public L As Long
Public Ba As Boolean
Public Bb As Boolean
Public Bc As Boolean
BeginProg
Fa = 0
Fb = 0.125
L = 126
Ba = Fa
'This will set Ba = False (0)
Bb = Fb 'This will Set Bb = True (-1)
Bc = L 'This will Set Bc = True (-1)
EndProg
FLOAT from LONG or Boolean
When a LONG or Boolean is converted to FLOAT , the integer value is loaded
into the FLOAT . Booleans are converted to -1 or 0 . LONG integers greater
than 24 bits (16,777,215; the size of the mantissa for a FLOAT ) will lose
resolution when converted to FLOAT .
LONG from FLOAT or Boolean
When converted to
Long, Boolean
is converted to
-1
or
0
. When a
FLOAT
is
converted to a
LONG
, it is truncated. This conversion is the same as the
INT
function (Arithmetic Functions). The conversion is to an integer equal to or less
than the value of the float; for example, 4.6 becomes 4 and – 4.6 becomes – 5 ).
If a FLOAT is greater than the largest allowable LONG (+2,147,483,647), the
integer is set to the maximum. If a FLOAT is less than the smallest allowable
LONG (–2,147,483,648), the integer is set to the minimum.
Integers in Expressions
LONG
s are evaluated in expressions as integers when possible. CRBasic example
Evaluation of Integers
(p. 223)
illustrates evaluation of integers as LONG s and
FLOAT s.