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Limits on the values of floating-point constants are given in Table 1.2. The header file FLOAT.H contains this information.
Table 1.2 Limits on Floating-Point Constants
| Constant | Meaning | Value |
| FLT_DIG DBL_DIG LDBL_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_EPSILON DBL_EPSILON LDBL_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_DIG DBL_MANT_DIG LDBL_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_MAX DBL_MAX LDBL_MAX |
Maximum representable floating-point number. | 3.402823466e+38F 1.7976931348623158e+308 1.7976931348623158e+308 |
| FLT_MAX_10_EXP DBL_MAX_10_EXP LDBL_MAX_10_EXP |
Maximum integer such that 10 raised to that number is a representable floating-point number. | 38 308 308 |
| FLT_MAX_EXP DBL_MAX_EXP LDBL_MAX_EXP |
Maximum integer such that FLT_RADIX raised to that number is a representable floating-point number. | 128 1024 1024 |
| FLT_MIN DBL_MIN LDBL_MIN |
Minimum positive value. | 1.175494351e–38F 2.2250738585072014e–308 2.2250738585072014e–308 |
| FLT_MIN_10_EXP DBL_MIN_10_EXP LDBL_MIN_10_EXP |
Minimum negative integer such that 10 raised to that number is a representable floating-point number. | –37 –307 –307 |
| FLT_MIN_EXP DBL_MIN_EXP LDBL_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 Table 1.2 may differ in future implementations.
END Microsoft Specific