Limits on Floating-Point Constants
The latest version of this topic can be found at Limits on Floating-Point Constants.
Microsoft Specific**
Limits on the values of floating-point constants are given in the following table. The header file FLOAT.H contains this information.
Limits on Floating-Point Constants
| Constant | Meaning | Value |
|---|---|---|
| FLT_DIGDBL_DIGLDBL_DIG | Number of digits, q, such that a floating-point number with q decimal digits can be rounded into a floating-point representation and back without loss of precision. | 6 15 15 |
| FLT_EPSILONDBL_EPSILONLDBL_EPSILON | Smallest positive number x, such that x + 1.0 is not equal to 1.0 | 1.192092896e–07F 2.2204460492503131e–016 2.2204460492503131e–016 |
| FLT_GUARD | 0 | |
| FLT_MANT_DIGDBL_MANT_DIGLDBL_MANT_DIG | Number of digits in the radix specified by FLT_RADIX in the floating-point significand. The radix is 2; hence these values specify bits. | 24 53 53 |
| FLT_MAXDBL_MAXLDBL_MAX | Maximum representable floating-point number. | 3.402823466e+38F 1.7976931348623158e+308 1.7976931348623158e+308 |
| FLT_MAX_10_EXPDBL_MAX_10_EXPLDBL_MAX_10_EXP | Maximum integer such that 10 raised to that number is a representable floating-point number. | 38 308 308 |
| FLT_MAX_EXPDBL_MAX_EXPLDBL_MAX_EXP | Maximum integer such that FLT_RADIX raised to that number is a representable floating-point number. | 128 1024 1024 |
| FLT_MINDBL_MINLDBL_MIN | Minimum positive value. | 1.175494351e–38F 2.2250738585072014e–308 2.2250738585072014e–308 |
| FLT_MIN_10_EXPDBL_MIN_10_EXPLDBL_MIN_10_EXP | Minimum negative integer such that 10 raised to that number is a representable floating-point number. | –37 –307 –307 |
| FLT_MIN_EXPDBL_MIN_EXPLDBL_MIN_EXP | Minimum negative integer such that FLT_RADIX raised to that number is a representable floating-point number. | –125 –1021 –1021 |
| FLT_NORMALIZE | 0 | |
| FLT_RADIX_DBL_RADIX_LDBL_RADIX | Radix of exponent representation. | 2 2 2 |
| FLT_ROUNDS_DBL_ROUNDS_LDBL_ROUNDS | Rounding mode for floating-point addition. | 1 (near) 1 (near) 1 (near) |
Note that the information in the above table may differ in future implementations.
END Microsoft Specific