macros, limits
macros and limits
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3
Macros and Limits Macros for math limits.

## Description

The macro names given in the following list must use the values specified. These constant expressions are suitable for use in `#if` preprocessing directives.

`#define FLT_DIG` | `6`
`#define FLT_MANT_DIG` | `24`
`#define FLT_MAX_10_EXP` | `+38`
`#define FLT_MAX_EXP` | `+128`
`#define FLT_MIN_10_EXP` | `-37`
`#define FLT_MIN_EXP` | `-125`
`#define FLT_RADIX` | `2`
`#define FLT_MAX` | `0x1.fffffep127f`
`#define FLT_MIN` | `0x1.0p-126f`
`#define FLT_EPSILON` | `0x1.0p-23f`

The macro names given in the following list (available if the double option is supported) must use the values specified. These constant expressions are suitable for use in `#if` preprocessing directives.

`#define DBL_DIG` | `15`
`#define DBL_MANT_DIG` | `53`
`#define DBL_MAX_10_EXP` | `+308`
`#define DBL_MAX_EXP` | `+1024`
`#define DBL_MIN_10_EXP` | `-307`
`#define DBL_MIN_EXP` | `-1021`
`#define DBL_MAX` | `0x1.fffffffffffffp1023`
`#define DBL_MIN` | `0x1.0p-1022`
`#define DBL_EPSILON` | `0x1.0p-52`

The macro names given in the following list must use the values specified. These constant expressions are suitable for use in `#if` preprocessing directives. An application that wants to use half and halfn types will need to include the `#pragma OPENCL EXTENSION cl_khr_fp16 : enable` directive.

`#define HALF_DIG` | `3`
`#define HALF_MANT_DIG` | `11`
`#define HALF_MAX_10_EXP` | `+4`
`#define HALF_MAX_EXP` | `+16`
`#define HALF_MIN_10_EXP` | `-4`
`#define HALF_MIN_EXP` | `-13`
`#define HALF_MAX` | `0x1.ffcp15h`
`#define HALF_MIN` | `0x1.0p-14h`
`#define HALF_EPSILON` | `0x1.0p-10h`

The macro names given in the following list must use the values specified. These constant expressions are suitable for use in `#if` preprocessing directives.

`#define CHAR_BIT` | `8`
`#define CHAR_MAX` | `SCHAR_MAX`
`#define CHAR_MIN` | `SCHAR_MIN`
`#define INT_MAX` | `2147483647`
`#define INT_MIN` | `(-2147483647- 1)`
`#define LONG_MAX` | `0x7fffffffffffffffL`
`#define LONG_MIN` | `(-0x7fffffffffffffffL- 1)`
`#define SCHAR_MAX` | `127`
`#define SCHAR_MIN` | `(-127 - 1)`
`#define SHRT_MAX` | `32767`
`#define SHRT_MIN` | `(-32767- 1)`
`#define UCHAR_MAX` | `255`
`#define USHRT_MAX` | `65535`
`#define UINT_MAX` | `0xffffffff`
`#define ULONG_MAX` | `0xffffffffffffffffUL`

## Specification

OpenCL Specification

## Also see

Math Functions, Symbolic Math Constants, Floating Point Pragma, Scalar Data Types, Vector Data Types, Reserved Data Types, Other Data Types

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