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Floating Limits

Microsoft Specific

The following table lists the limits on the values of floating-point constants. These limits are also defined in the standard header file FLOAT.H.

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   The information in the table may differ in future versions of the product.

END Microsoft Specific

See Also

Integer Limits

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