## Linux and UNIX Man Pages

Test Your Knowledge in Computers #249
Difficulty: Easy
Senator Albert Gore, Jr. authored the High Performance Computing and Communication Act of 1991, creating what Gore referred to as the information superhighway.
True or False?

# rintf(3m) [opensolaris man page]

```rint(3M)						  Mathematical Library Functions						  rint(3M)

NAME
rint, rintf, rintl - round-to-nearest integral value

SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

double rint(double x);

float rintf(float x);

long double rintl(long double x);

DESCRIPTION
These functions return the integral value (represented as a double) nearest x in the direction of the current rounding mode.

If the current rounding mode rounds toward negative infinity, rint() is equivalent to floor(3M). If the current rounding mode rounds toward
positive infinity, rint() is equivalent to ceil(3M).

These functions differ from the nearbyint(3M), nearbyintf(), and nearbyintl() functions only in that they might raise the inexact floating-
point exception if the result differs in value from the argument.

RETURN VALUES
Upon successful completion, these functions return the integer (represented as a double precision number) nearest x in the direction of the
current rounding mode.

If x is NaN, a NaN is returned.

If x is +-0 or +-Inf, x is returned.

ATTRIBUTES
See attributes(5) for descriptions of the following attributes:

+-----------------------------+-----------------------------+
|      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
+-----------------------------+-----------------------------+
|Interface Stability	     |Standard			   |
+-----------------------------+-----------------------------+
|MT-Level		     |MT-Safe			   |
+-----------------------------+-----------------------------+

abs(3C), ceil(3M), feclearexcept(3M), fetestexcept(3M), floor(3M), isnan(3M), math.h(3HEAD), nearbyint(3M), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							  rint(3M)```

## Check Out this Related Man Page

```RINT(3P)						     POSIX Programmer's Manual							  RINT(3P)

PROLOG
This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME
rint, rintf, rintl - round-to-nearest integral value

SYNOPSIS
#include <math.h>

double rint(double x);
float rintf(float x);
long double rintl(long double x);

DESCRIPTION
These functions shall return the integral value (represented as a double) nearest x in the direction of the current rounding mode. The cur-
rent rounding mode is implementation-defined.

If  the	current  rounding  mode  rounds toward negative infinity, then rint() shall be equivalent to floor(). If the current rounding mode
rounds toward positive infinity, then rint() shall be equivalent to ceil().

These functions differ from the nearbyint(), nearbyintf(), and nearbyintl() functions only in that they may  raise  the	inexact  floating-
point exception if the result differs in value from the argument.

An  application	wishing  to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these
functions.  On return, if errno is non-zero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero,  an  error
has occurred.

RETURN VALUE
Upon  successful completion, these functions shall return the integer (represented as a double precision number) nearest x in the direction
of the current rounding mode.

If x is NaN, a NaN shall be returned.

If x is +-0 or +-Inf, x shall be returned.

If the correct value would cause overflow, a range error shall occur and rint(), rintf(), and rintl() shall return the value of	the  macro
+-HUGE_VAL, +-HUGE_VALF, and +-HUGE_VALL (with the same sign as x), respectively.

ERRORS
These functions shall fail if:

Range Error
The result would cause an overflow.

If  the	integer  expression  (math_errhandling	&  MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression
(math_errhandling & MATH_ERREXCEPT) is non-zero, then the overflow floating-point exception shall be raised.

The following sections are informative.

EXAMPLES
None.

APPLICATION USAGE
On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of  each  other,  but	at
least one of them must be non-zero.

RATIONALE
None.

FUTURE DIRECTIONS
None.