Data Type Constants
The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at Data Type Constants.
Data type constants are implementation-dependent ranges of values allowed for integral data types. The constants listed below give the ranges for the integral data types and are defined in LIMITS.H.
Note
The /J compiler option changes the default char type to unsigned.
| Constant | Value | Meaning |
|---|---|---|
| SCHAR_MAX | 127 | Maximum signed char value |
| SCHAR_MIN | –128 | Minimum signed char value |
| UCHAR_MAX | 255 (0xff) | Maximum unsigned char value |
| CHAR_BIT | 8 | Number of bits in a char |
| USHRT_MAX | 65535 (0xffff) | Maximum unsigned short value |
| SHRT_MAX | 32767 | Maximum (signed) short value |
| SHRT_MIN | –32768 | Minimum (signed) short value |
| UINT_MAX | 4294967295 (0xffffffff) | Maximum unsigned int value |
| ULONG_MAX | 4294967295 (0xffffffff) | Maximum unsigned long value |
| INT_MAX | 2147483647 | Maximum (signed) int value |
| INT_MIN | –2147483647–1 | Minimum (signed) int value |
| LONG_MAX | 2147483647 | Maximum (signed) long value |
| LONG_MIN | –2147483647–1 | Minimum (signed) long value |
| CHAR_MAX | 127 (255 if /J option used) | Maximum char value |
| CHAR_MIN | –128 (0 if /J option used) | Minimum char value |
| MB_LEN_MAX | 2 | Maximum number of bytes in multibyte char |
| _I64_MAX | 9223372036854775807 | Maximum (signed) __int64 value |
| _I64_MIN | -9223372036854775807-1 | Minimum (signed) __int64 value |
| _UI64_MAX | 0xffffffffffffffff | Maximum (unsigned) __int64 value |
The following constants give the range and other characteristics of the double and float data types, and are defined in FLOAT.H:
| Constant | Value | Description |
|---|---|---|
| DBL_DIG | 15 | # of decimal digits of precision |
| DBL_EPSILON | 2.2204460492503131e-016 | Smallest such that 1.0+DBL_EPSILON !=1.0 |
| DBL_MANT_DIG | 53 | # of bits in mantissa |
| DBL_MAX | 1.7976931348623158e+308 | Maximum value |
| DBL_MAX_10_EXP | 308 | Maximum decimal exponent |
| DBL_MAX_EXP | 1024 | Maximum binary exponent |
| DBL_MIN | 2.2250738585072014e-308 | Minimum positive value |
| DBL_MIN_10_EXP | (-307) | Minimum decimal exponent |
| DBL_MIN_EXP | (–1021) | Minimum binary exponent |
| _DBL_RADIX | 2 | Exponent radix |
| _DBL_ROUNDS | 1 | Addition rounding: near |
| FLT_DIG | 6 | Number of decimal digits of precision |
| FLT_EPSILON | 1.192092896e-07F | Smallest such that 1.0+FLT_EPSILON !=1.0 |
| FLT_MANT_DIG | 24 | Number of bits in mantissa |
| FLT_MAX | 3.402823466e+38F | Maximum value |
| FLT_MAX_10_EXP | 38 | Maximum decimal exponent |
| FLT_MAX_EXP | 128 | Maximum binary exponent |
| FLT_MIN | 1.175494351e-38F | Minimum positive value |
| FLT_MIN_10_EXP | (–37) | Minimum decimal exponent |
| FLT_MIN_EXP | (–125) | Minimum binary exponent |
| FLT_RADIX | 2 | Exponent radix |
| FLT_ROUNDS | 1 | Addition rounding: near |