double_t(3type)

NAME

float_t, double_t - most efficient floating types

LIBRARY

Math library (libm)

SYNOPSIS

#include <math.h>

typedef /* ... */ float_t;
typedef /* ... */ double_t;

DESCRIPTION

The implementation's most efficient floating types at least as wide as float and double respectively. Their type depends on the value of the macro FLT_EVAL_METHOD (defined in <float.h>):

FLT_EVAL_METHOD	float_t	double_t
0	float	double
1	double	double
2	long double	long double

For other values of FLT_EVAL_METHOD, the types of float_t and double_t are implementation-defined.

STANDARDS

C11, POSIX.1-2008.

HISTORY

C99, POSIX.1-2001.