float.h

#define FLT_ROUNDS 1
#define FLT_EVAL_METHOD 2

#define LDBL_MIN     3.3621031431120935063e-4932L
#define LDBL_MAX     1.1897314953572317650e+4932L
#define LDBL_EPSILON 1.0842021724855044340e-19L

#define LDBL_MANT_DIG 64
#define LDBL_MIN_EXP (-16381)
#define LDBL_MAX_EXP 16384

#define LDBL_DIG 18
#define LDBL_MIN_10_EXP (-4931)
#define LDBL_MAX_10_EXP 4932