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Constant
(macro)
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FLT_RADIX
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2
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Indicates the radix in exponent representation.
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FLT_ROUNDS
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1 or 0
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Indicates whether or not the result of an add operation is rounded off.
The meaning of this macro definition is as follows:
When result of add operation is rounded off: 1
When result of add operation is rounded down: 0
The rounding-off and rounding-down methods are implementation-defined.
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Constant
(macro)
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FLT_MAX
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3.4028235677973364e
+38F
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Indicates the maximum value that can be represented as a float type floating-point value.
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DBL_MAX
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1.7976931348623158e
+308
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Indicates the maximum value that can be represented as a double type floating-point value.
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LDBL_MAX
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1.7976931348623158e
+308
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Indicates the maximum value that can be represented as a long double type floating-point value.
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FLT_MAX_EXP
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127
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Indicates the power-of-radix maximum value that can be represented as a float type floating-point value.
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DBL_MAX_EXP
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1023
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Indicates the power-of-radix maximum value that can be represented as a double type floating-point value.
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LDBL_MAX_EXP
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1023
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Indicates the power-of-radix maximum value that can be represented as a long double type floating-point value.
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FLT_MAX_10_
EXP
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38
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Indicates the power-of-10 maximum value that can be represented as a float type floating-point value.
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DBL_MAX_10_
EXP
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308
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Indicates the power-of-10 maximum value that can be represented as a double type floating-point value.
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LDBL_MAX_10_
EXP
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308
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Indicates the power-of-10 maximum value that can be represented as a long double type floating-point value.
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FLT_MIN
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1.175494351e−38F
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Indicates the minimum positive value that can be represented as a float type floating-point value.
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DBL_MIN
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2.2250738585072014e
−308
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Indicates the minimum positive value that can be represented as a double type floating-point value.
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LDBL_MIN
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2.2250738585072014e
−308
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Indicates the minimum positive value that can be represented as a long double type floating-point value.
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FLT_MIN_EXP
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−149
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Indicates the power-of-radix minimum value of a floating-point value that can be represented as a float type positive value.
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DBL_MIN_EXP
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−1074
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Indicates the power-of-radix minimum value of a floating-point value that can be represented as a double type positive value.
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LDBL_MIN_EXP
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−1074
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Indicates the power-of-radix minimum value of a floating-point value that can be represented as a long double type positive value.
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Constant
(macro)
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FLT_MIN_10_EXP
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−44
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Indicates the power-of-10 minimum value of a floating-point value that can be represented as a float type positive value.
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DBL_MIN_10_
EXP
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−323
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Indicates the power-of-10 minimum value of a floating-point value that can be represented as a double type positive value.
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LDBL_MIN_10_
EXP
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−323
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Indicates the power-of-10 minimum value of a floating-point value that can be represented as a long double type positive value.
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FLT_DIG
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6
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Indicates the maximum number of digits in float type floating-point value decimal-precision.
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DBL_DIG
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15
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Indicates the maximum number of digits in double type floating-point value decimal-
precision.
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LDBL_DIG
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15
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Indicates the maximum number of digits in long double type floating-point value decimal-precision.
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FLT_MANT_DIG
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24
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Indicates the maximum number of mantissa digits when a float type floating-point value is represented in the radix.
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DBL_MANT_DIG
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53
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Indicates the maximum number of mantissa digits when a double type floating-point value is represented in the radix.
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LDBL_MANT_DIG
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53
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Indicates the maximum number of mantissa digits when a long double type floating-point value is represented in the radix.
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FLT_EXP_DIG
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8
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Indicates the maximum number of exponent digits when a float type floating-point value is represented in the radix.
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DBL_EXP_DIG
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11
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Indicates the maximum number of exponent digits when a double type floating-point value is represented in the radix.
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LDBL_EXP_DIG
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11
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Indicates the maximum number of exponent digits when a long double type floating-point value is represented in the radix.
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FLT_POS_EPS
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5.9604648328104311e−8F
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Indicates the minimum floating-point value x for which 1.0 + x ≠ 1.0 in float type.
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DBL_POS_EPS
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1.1102230246251567e−16
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Indicates the minimum floating-point value x for which 1.0 + x ≠ 1.0 in double type.
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LDBL_POS_EPS
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1.1102230246251567e−16
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Indicates the minimum floating-point value x for which 1.0 + x ≠ 1.0 in long double type.
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FLT_NEG_EPS
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2.9802324164052156e−8F
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Indicates the minimum floating-point value x for which 1.0 – x ≠ 1.0 in float type.
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DBL_NEG_EPS
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5.5511151231257834e−17
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Indicates the minimum floating-point value x for which 1.0 – x ≠ 1.0 in double type
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LDBL_NEG_EPS
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5.5511151231257834e−17
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Indicates the minimum floating-point value x for which 1.0 – x ≠ 1.0 in long double type.
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Constant
(macro)
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FLT_POS_EPS_
EXP
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−23
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Indicates the minimum integer n for which 1.0 + (radix)n ≠ 1.0 in float type.
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DBL_POS_EPS_
EXP
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−52
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Indicates the minimum integer n for which 1.0 +(radix)n ≠ 1.0 in double type.
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LDBL_POS_EPS_EXP
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−52
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Indicates the minimum integer n for which 1.0 + (radix)n ≠ 1.0 in long double type.
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FLT_NEG_EPS_
EXP
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−24
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Indicates the minimum integer n for which 1.0 – (radix)n ≠ 1.0 in float type.
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DBL_NEG_EPS_
EXP
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−53
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Indicates the minimum integer n for which 1.0 – (radix)n ≠ 1.0 in double type.
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LDBL_NEG_EPS_EXP
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−53
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Indicates the minimum integer n for which 1.0 – (radix)n ≠ 1.0 in long double type.
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DECIMAL_DIG
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10
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Indicates the maximum number of digits of a floating-point value represented in decimal precision.
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FLT_EPSILON
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1E−5
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Indicates the difference between 1 and the minimum value greater than 1 that can be represented in float type.
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DBL_EPSILON
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1E−9
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Indicates the difference between 1 and the minimum value greater than 1 that can be represented in double type.
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LDBL_EPSILON
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1E−9
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Indicates the difference between 1 and the minimum value greater than 1 that can be represented in long double type.
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