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The float header defines the minimum and maximum
limits of floating-point number values.
Defined Values
A floating-point number is defined in the following
manner:
sign value E exponent
Where sign is plus or minus, value is the
value of the number, and exponent is the value of the
exponent.
The following values are defined with the
#define directive. These values are
implementation-specific, but may not be any lower than what
is given here. Note that in all instances FLT
refers to type float, DBL refers to
double, and LDBL refers to long double.
FLT_ROUNDS
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Defines the way floating-point numbers are
rounded.
-1 |
indeterminable |
0 |
toward zero |
1 |
to nearest |
2 |
toward positive infinity |
3 |
toward negative infinity |
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FLT_RADIX 2
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Defines the base (radix) representation of the
exponent (i.e. base-2 is binary, base-10 is the
normal decimal representation, base-16 is Hex).
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FLT_MANT_DIG
DBL_MANT_DIG
LDBL_MANT_DIG
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Defines the number of digits in the number (in
the FLT_RADIX base).
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FLT_DIG 6
DBL_DIG 10
LDBL_DIG 10
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The maximum number decimal digits (base-10) that
can be represented without change after rounding.
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FLT_MIN_EXP
DBL_MIN_EXP
LDBL_MIN_EXP
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The minimum negative integer value for an
exponent in base FLT_RADIX.
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FLT_MIN_10_EXP -37
DBL_MIN_10_EXP -37
LDBL_MIN_10_EXP -37
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The minimum negative integer value for an
exponent in base 10.
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FLT_MAX_EXP
DBL_MAX_EXP
LDBL_MAX_EXP
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The maximum integer value for an exponent in
base FLT_RADIX.
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FLT_MAX_10_EXP +37
DBL_MAX_10_EXP +37
LDBL_MAX_10_EXP +37
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The maximum integer value for an exponent in
base 10.
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FLT_MAX 1E+37
DBL_MAX 1E+37
LDBL_MAX 1E+37
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Maximum finite floating-point value.
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FLT_EPSILON 1E-5
DBL_EPSILON 1E-9
LDBL_EPSILON 1E-9
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Least significant digit represent able.
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FLT_MIN 1E-37
DBL_MIN 1E-37
LDBL_MIN 1E-37
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Minimum floating-point value. |
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