9.2 Integer Data Types

The following table shows integer data types that are supported in the compiler. All unspecified or signed integer data types are arithmetic type signed integer. All unsigned integer data types are arithmetic type unsigned integer.

Table 9-1. Integer Data Types - dsPIC33A Devices Only
Type	Bits	Min.	Max.
`char, signed char`	8	-128	127
`unsigned char`	8	0	255
`short, signed short`	16	-32768	32767
`unsigned short`	16	0	65535
`int, signed int`	32	-2³¹	2³¹ - 1
`unsigned int`	32	0	2³² - 1
`long, signed long`	32	-2³¹	2³¹ - 1
`unsigned long`	32	0	2³² - 1
`long long, signed long long`	64	-2⁶³	2⁶³ - 1
`unsigned long long`	64	0	2⁶⁴ - 1

Table 9-2. Integer Data Types - dsPIC33C/E/F and dsPIC30F Devices Only
Type	Bits	Min.	Max.
`char, signed char`	8	-128	127
`unsigned char`	8	0	255
`short, signed short`	16	-32768	32767
`unsigned short`	16	0	65535
`int, signed int`	16	-32768	32767
`unsigned int`	16	0	65535
`long, signed long`	32	-2³¹	2³¹ - 1
`unsigned long`	32	0	2³² - 1
`long long, signed long long`	64	-2⁶³	2⁶³ - 1
`unsigned long long`	64	0	2⁶⁴ - 1

There is no type for storing single bit quantities.

All integer values are specified in little endian format, which means:

The least significant byte (LSB) is stored at the lowest address
The least significant bit (LSb) is stored at the lowest-numbered bit position

As an example, the long value of 0x12345678 is stored at address 0x100 as follows:


`0x100`	`0x101`	`0x102`	`0X103`
`0x78`	`0x56`	`0x34`	`0x12`

As another example, for dsPIC33C/E/F and dsPIC30F devices the long value of 0x12345678 is stored in registers w4 and w5:


w4	w5
`0x5678`	`0x1234`

Signed values are stored as a two’s complement integer value.

Preprocessor macros that specify integer minimum and maximum values are available after including <limits.h> in your source code, located by default in:

<install directory>\include

As the size of data types is not fully specified by the ANSI 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.

For information on implementation-defined behavior of integers, see 22.5 Integers.