4.3.2 Integer Data Types
The MPLAB XC8 compiler supports integer data types with 1, 2, 4 and 8 byte sizes. Tabulated below are the supported data types and their corresponding size and arithmetic type.
| Type | Size (bits) | Arithmetic Type |
|---|---|---|
signed char |
8 | Signed integer |
unsigned char |
8 | Unsigned integer |
signed short |
16 | Signed integer |
unsigned short |
16 | Unsigned integer |
signed int |
16 | Signed integer |
unsigned int |
16 | Unsigned integer |
signed long |
32 | Signed integer |
unsigned long |
32 | Unsigned integer |
signed long long |
64 | Signed integer |
unsigned long long |
64 | Unsigned integer |
If no type signedness is specified (including char
types), then that type is signed.
All integer values are represented in little endian format with the Least Significant Byte (LSB) at the lower address in the device memory.
Signed values are stored as a two’s complement integer value.
The range of values capable of being held by these types is summarized in the declarations
for <limits.h>, contained in the Microchip Unified Standard Library
Reference Guide. The symbols presented there are preprocessor macros that are
available after including <limits.h> in your source code. As the
size of data types are not fully specified by the C Standard, these macros allow for more
portable code which can check the limits of the range of values held by the type on this
implementation.
Macros are also available in <stdint.h> which define
values associated with fixed-width types, such as int8_t,
uint32_t etc.