Data Type Constants
Remarks
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 |
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 |