<float.h>
The header float.h in the C Standard Library for the C programming language contains macros that expand to various limits and parameters of the standard floating-point types.
• 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 - 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 - (at least 10)
• FLT_DIG, DBL_DIG, LDBL_DIG - (at least 6, 10, 10)
• FLT_MIN_10_EXP, DBL_MIN_10_EXP, LDBL_MIN_10_EXP, (at least -37)
• 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, at least 1E-5, 1E-9, 1E-9)
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