C programming/float.h

The header float.h contains macros that expand to various limits and parameters of the standard floating-point types. The macros, as defined on ISO 9899:1999 section 5.2.4.2.2, are: FLT_ROUNDS – indicates the rounding mode for floating-point addition, meaning: -1 indeterminable; 0 toward zero; 1 to nearest; 2 toward positive infinity; 3 toward negative infinity; other value means implementation-defined rounding behavior. FLT_EVAL_METHOD (C99) – determines the evaluation formats of expressions involving all floating types: -1 indeterminable; 0 evaluate all operations and constants just to the precision of the type; 1 evaluate operations and constants of type float and double to the range and precision of the double type; 2 evaluate all operations and constants to the range and precision of the long double type; other value means implementation-defined behavior. FLT_RADIX – radix of exponent representation (at least 2). FLT_MANT_DIG, DBL_MANT_DIG, LDBL_MANT_DIG – number of digits in the floating-point significand. DECIMAL_DIG (C99) – (at least 10) FLT_DIG, DBL_DIG, LDBL_DIG - (at least 6, 10, 10) FLT_MIN_EXP, DBL_MIN_EXP, LDBL_MIN_EXP FLT_MIN_10_EXP, DBL_MIN_10_EXP, LDBL_MIN_10_EXP, (at least -37) FLT_MAX_EXP, DBL_MAX_EXP, LDBL_MAX_EXP FLT_MAX_10_EXP, DBL_MAX_10_EXP, LDBL_MAX_10_EXP (at least +37) FLT_MAX, DBL_MAX, LDBL_MAX – (Maximum value, at least 1E+37) FLT_EPSILON, DBL_EPSILON, LDBL_EPSILON – (Machine epsilon, no greater than 1E-5, 1E-9, 1E-9) FLT_MIN, DBL_MIN, LDBL_MIN – (no greater than 1E-37) External links bd float.h SUS floating types C++ reference for implementation defined numeric constants inherited from C it:Float.h pl:C/Biblioteka_standardowa/Indeks_tematyczny#float.h pt:Float.h ru:Float.h uk:Float.h