Atmel CAVR-4 사용자 설명서
CAVR-4
138
Basic data types
AVR® IAR C/C++ Compiler
Reference Guide
Basic data types
The compiler supports both all ISO/ANSI C basic data types and some additional types.
INTEGER TYPES
The following table gives the size and range of each integer data type:
Signed variables are represented using the two’s complement form.
Bool
The
bool
data type is supported by default in the C++ language. If you have enabled
language extensions, the
bool
type can also be used in C source code if you include the
file
stdbool.h
. This will also enable the boolean values
false
and
true
.
The enum type
ISO/ANSI C specifies that constants defined using the
enum
construction should be
representable using the type
int
. The compiler will use the shortest signed or unsigned
type required to contain the values.
When IAR Systems language extensions are enabled, and in C++, the
enum
constants
and types can also be of the type
long
or
unsigned
long
.
Data type
Size
Range
Alignment
bool
8 bits
0 to 1
1
char
8 bits
0 to 255
1
signed char
8 bits
-128 to 127
1
unsigned char
8 bits
0 to 255
1
signed short
16 bits
-32768 to 32767
1
unsigned short
16 bits
0 to 65535
1
signed int
16 bits
-32768 to 32767
1
unsigned int
16 bits
0 to 65535
1
signed long
32 bits
-2
31
to 2
31
-1
1
unsigned long
32 bits
0 to 2
32
-1
1
signed long long
64 bits
-2
63
to 2
63
-1
1
unsigned long long
64 bits
0 to 2
64
-1
1
Table 31: Integer types