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MPLAB ? C32 C Compiler User’s Guide
TABLE 1-1:
Extensions
file .S
other
FILE NAMES (CONTINUED)
Definition
An assembly language source file that must be preprocessed.
A file to be passed to the linker.
1.5
DATA STORAGE
1.5.1
Storage Endianness
MPLAB C32 C compiler stores multi-byte values in little-endian format. That is, the
least significant byte is stored at the lowest address.
For example, the 32-bit value 0x12345678 would be stored at address 0x100 as:
Address
Data
0x100
0x78
0x101
0x56
0x102
0x34
0x103
0x12
1.5.2
Integer Representation
Integer values in MPLAB C32 C compiler are represented in 2's complement and vary
Type
char , signed char
unsigned char
short , signed short
unsigned short
int , signed int , long , signed long
unsigned int , unsigned long
long long , signed long long
unsigned long long
8
8
16
16
32
32
64
64
Bits
Min
-128
0
-32768
0
-2 31
0
-2 63
0
Max
127
255
32767
65535
2 31 -1
2 32 -1
2 63 -1
2 64 -1
1.5.3
Signed and Unsigned Character Types
By default, values of type plain char are signed values. This behavior is
implementation-defined by the C standard, and some environments 1 define a plain
char value to be unsigned. The command line option -funsigned-char can be used
to set the default type to unsigned for a given translation unit.
1.5.4
Floating-Point Representation
MPLAB C32 C compiler uses the IEEE-754 floating-point format. Detail regarding the
implementation limits is available to a translation unit in float.h.
float
double
long double
Type
32
64
64
Bits
1.5.5
Pointers
Pointers in MPLAB C32 C compiler are all 32 bits in size.
1. Notably, PowerPC and ARM
DS51686A-page 8
? 2007 Microchip Technology Inc.
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