6.9.1 Implementation-Defined Limit Macros

Include

<limits.h>

Remarks

The macros in the following table relate to the sizes of the integer types and expand to constant expressions that can be used in the controlling expression with #if preprocessor directives.

The baseline and non-enhanced mid-range PIC devices supported by MPLAB XC8 do not implement 64-bit integer types, and all the long long int integer types are 32 bits wide for these devices. For all other devices, regardless of compiler utilized, the long long int types are 64-bit wide.

Table 6-4. Declarations Provided by <limits.h>
Macro Name	Description	Value
`CHAR_BIT`	Number of bits to represent type `char`	`8`
`CHAR_MAX`	Maximum value of a `char`	When `-funsigned-char` is in effect (or using XC8 for PIC devices and no plain `char` type option has been used): `255` When `-fsigned-char` is in effect (or using any other compiler and no plain `char` type option has been used): `127`
`CHAR_MIN`	Minimum value of a `char`	When `-funsigned-char` is in effect (or using XC8 for PIC devices and no plain `char` type option has been used): `0` When `-fsigned-char` is in effect (or using any other compiler and no plain `char` type option has been used): `-128`
`UCHAR_MAX`	Maximum value of an `unsigned char`	`255`
`SCHAR_MAX`	Maximum value of a `signed char`	`127`
`SCHAR_MIN`	Minimum value of a `signed char`	`-128`
`USHRT_MAX`	Maximum value of an `unsigned short int`	`65535`
`SHRT_MAX`	Maximum value of a `short int`	`32767`
`SHRT_MIN`	Minimum value of a `short int`	`-32768`
`UINT_MAX`	Maximum value of an `unsigned int`	MPLAB XC8: `65535` MPLAB XC-DSC (dsPIC33A devices): `4294967295` MPLAB XC16 and XC-DSC (other devices): `65535` MPLAB XC32: `4294967295`
`INT_MAX`	Maximum value of a `int`	MPLAB XC8: `32767` MPLAB XC-DSC (dsPIC33A devices): `2147483647` MPLAB XC16 and XC-DSC (other devices): `32767` MPLAB XC32: `2147483647`
`INT_MIN`	Minimum value of a `int`	MPLAB XC8: `-32768` MPLAB XC-DSC (dsPIC33A devices): `-2147483648` MPLAB XC16 and XC-DSC (other devices): `-32768` MPLAB XC32: `-2147483648`
`ULONG_MAX`	Maximum value of a `long unsigned int`	`4294967295`
`LONG_MAX`	Maximum value of a `long int`	`2147483647`
`LONG_MIN`	Minimum value of a `long int`	`-2147483648`
`ULLONG_MAX`	Maximum value of a `long long unsigned int`	Devices lacking 64 bit support (see Remarks): `4294967295` All other devices: `18446744073709551615`
`LLONG_MAX`	Maximum value of a `long long int`	Devices lacking 64 bit support (see Remarks): `2147483647` All other devices: `9223372036854775807`
`LLONG_MIN`	Minimum value of a `long long int`	Devices lacking 64 bit support (see Remarks): `-2147483648` All other devices: `-9223372036854775808`
`MB_LEN_MAX`	Maximum number of bytes in a multibyte character	MPLAB XC8: `1` MPLAB XC16 and XC-DSC: `4` MPLAB XC32: `16`