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PCD
DATA DEFINITIONS
Basic and Special types
This section describes what the basic data types and specifiers
are and how variables can be declared using those types. In C all
the variables should be declared before they are used. They can
be defined inside a function (local) or outside all functions
(global). This will affect the visibility and life of the variables.
Basic Types
Range
Type-Specifier
int1
int8
int16
int32
int48
int64
float32
Size
1 bit number
8 bit number
16 bit number
32 bit number
48 bit number
64 bit number
32 bit float
Unsigned
0 to 1
0 to 255
0 to 65535
0 to 4294967295
0 to
281474976710655
N/A
-1.5 x 10 45 to 3.4 x 10 38
Signed
N/A
-128 to 127
-32768 to 32767
-2147483648 to 2147483647
-140737488355328 to
140737488355327
-9223372036854775808 to
9223372036854775807
Digits
1/2
2-3
4-5
9-10
14-15
18-19
7-8
C Standard Type
short
char
int
long
long long
float
double
Default Type
int1
unsigned int8
int8
int16
int32
float32
N/A
Type-Qualifier
Variable is globally active and initialized to 0. Only accessible from this compilation
static
auto
22
unit.
Variable exists only while the procedure is active. This is the default and AUTO need
not be used.
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