# nextafterf(3) [netbsd man page]

```NEXTAFTER(3)						   BSD Library Functions Manual 					      NEXTAFTER(3)

NAME
nextafter, nextafterf, nextafterl, nexttoward -- next representable floating-point number

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
nextafter(double x, double y);

float
nextafterf(float x, float y);

long double
nextafterl(long double x, long double y);

double
nexttoward(double x, long double y);

DESCRIPTION
The nextafter(), nextafterf(), and nextafterl() functions return the next machine representable number from x in direction of y.  In other
words, if y is less than x, the functions return the largest representable floating-point number less than x.  When x equals y, the value of
y is returned.  The three functions differ only in the type of the return value and x.

The nexttoward() function is equivalent to the nextafter() family of functions with two exceptions:

1.	The second parameter has a type long double.

2.	The return value is y converted to the type of the function, provided that x equals y.

RETURN VALUES
Upon successful completion, the described functions return the next representable floating-point value as described above.  If x is finite
but an overflow would occur, a range error follows and the functions return +-HUGE_VAL, +-HUGE_VALF, or +-HUGE_VALL with the same sign as x.
When either x or y is NaN, a NaN is returned.  When x is not y but the function value is subnormal, zero, or underflows, a range error
occurs, and either 0.0 or the correct function value (if representable) is returned.

math(3)

STANDARDS
The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').

BSD								September 18, 2011							       BSD```

## Check Out this Related Man Page

```NEXTAFTER(3)						   BSD Library Functions Manual 					      NEXTAFTER(3)

NAME
nextafter, nextafterf, nextafterl, nexttoward -- next representable floating-point number

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
nextafter(double x, double y);

float
nextafterf(float x, float y);

long double
nextafterl(long double x, long double y);

double
nexttoward(double x, long double y);

DESCRIPTION
The nextafter(), nextafterf(), and nextafterl() functions return the next machine representable number from x in direction of y.  In other
words, if y is less than x, the functions return the largest representable floating-point number less than x.  When x equals y, the value of
y is returned.  The three functions differ only in the type of the return value and x.

The nexttoward() function is equivalent to the nextafter() family of functions with two exceptions:

1.	The second parameter has a type long double.

2.	The return value is y converted to the type of the function, provided that x equals y.

RETURN VALUES
Upon successful completion, the described functions return the next representable floating-point value as described above.  If x is finite
but an overflow would occur, a range error follows and the functions return +-HUGE_VAL, +-HUGE_VALF, or +-HUGE_VALL with the same sign as x.
When either x or y is NaN, a NaN is returned.  When x is not y but the function value is subnormal, zero, or underflows, a range error
occurs, and either 0.0 or the correct function value (if representable) is returned.

math(3)

STANDARDS
The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').

BSD								September 18, 2011							       BSD```
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