Float.h

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C Standard Library headers
C++ standard library>C++ Standard Library headers
assert.h
ctype.h
errno.h
float.h
math.h
stdio.h
stdlib.h
time.h

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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.

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 behaviour.

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 evaulate 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_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 - (at least 1E+37)

FLT_EPSILON, DBL_EPSILON, LDBL_EPSILON - (at least 1E-5, 1E-9, 1E-9)

FLT_MIN, DBL_MIN, LDBL_MIN - (at least 1E-37)

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