| 1 | /* The header float.h defines several macros that expand to various
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| 2 | * limits and parameters of the standard floating-point types.
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| 3 | */
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| 4 |
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| 5 | #ifndef _FLOAT_
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| 6 | #define _FLOAT_
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| 7 |
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| 8 | /* Addition rounds to 0: zero, 1: nearest, 2: +inf, 3: -inf, -1: indeterminable */
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| 9 | #define FLT_ROUNDS 1
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| 10 |
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| 11 | /* -1: indeterminable;
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| 12 | * 0: evaluate all operations and constants;
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| 13 | * 1: evaluate float and double to the precision of double, long double to long double
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| 14 | * 2: evaluate all operations and constants to the range and precision of the
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| 15 | * long double type
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| 16 | */
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| 17 | #define FLT_EVAL_METHOD 1
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| 18 |
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| 19 | /*-1: indeterminable; 0: absent; 1: present;*/
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| 20 | #define FLT_HAS_SUBNORM 1
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| 21 | #define DBL_HAS_SUBNORM 1
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| 22 | #define LDBL_HAS_SUBNORM 1
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| 23 |
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| 24 | /* Radix of exponent representation */
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| 25 | #define FLT_RADIX 2
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| 26 |
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| 27 | /* Number of base-FLT_RADIX digits in the significant of a float */
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| 28 | #define FLT_MANT_DIG FLT_MANT_DIG
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| 29 | /* Number of base-FLT_RADIX digits in the significant of a double */
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| 30 | #define DBL_MANT_DIG DBL_MANT_DIG
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| 31 | /* Number of base-FLT_RADIX digits in the significant of a long double */
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| 32 | #define LDBL_MANT_DIG LDBL_MANT_DIG
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| 33 |
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| 34 | /* Number of decimal digits */
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| 35 | #define DECIMAL_DIG 10
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| 36 | #define FLT_DIG 6
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| 37 | #define DBL_DIG 10
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| 38 | #define LDBL_DIG 10
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| 39 |
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| 40 | /* Minimum negative integer */
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| 41 | #define FLT_MIN_EXP FLT_MIN_EXP
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| 42 | #define DBL_MIN_EXP DBL_MIN_EXP
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| 43 | #define LDBL_MIN_EXP LDBL_MIN_EXP
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| 44 | #define FLT_MIN_10_EXP -37
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| 45 | #define DBL_MIN_10_EXP -37
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| 46 | #define LDBL_MIN_10_EXP -37
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| 47 |
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| 48 | /* Maximum integer */
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| 49 | #define FLT_MAX_EXP FLT_MAX_EXP // eg: 32
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| 50 | #define DBL_MAX_EXP DBL_MAX_EXP // eg: 1024
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| 51 | #define LDBL_MAX_EXP LDBL_MAX_EXP
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| 52 | #define FLT_MAX_10_EXP +37
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| 53 | #define DBL_MAX_10_EXP +37
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| 54 | #define LDBL_MAX_10_EXP +37
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| 55 |
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| 56 | /* Maximum representable finite floating-point number */
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| 57 | #define FLT_MAX 1E+37
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| 58 | #define DBL_MAX 1E+37
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| 59 | #define LDBL_MAX 1E+37
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| 60 |
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| 61 | /* The difference between 1 and the least value greater than 1 that is representable in the
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| 62 | * given floating point type
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| 63 | */
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| 64 | #define FLT_EPSILON 1E-5
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| 65 | #define DBL_EPSILON 1E-9
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| 66 | #define LDBL_EPSILON 1E-9
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| 67 |
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| 68 | /* minimum normalized positive floating-point number */
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| 69 | #define FLT_MIN 1E-37
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| 70 | #define DBL_MIN 1E-37
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| 71 | #define LDBL_MIN 1E-37
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| 72 |
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| 73 | /* Minimum positive floating-point number */
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| 74 | #define FLT_TRUE_MIN 1E-37
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| 75 | #define DBL_TRUE_MIN 1E-37
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| 76 | #define LDBL_TRUE_MIN 1E-37
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| 77 |
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| 78 | #endif
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