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roundl(3) [posix man page]

ROUND(P)						     POSIX Programmer's Manual							  ROUND(P)

NAME
round, roundf, roundl - round to the nearest integer value in a floating-point format SYNOPSIS
#include <math.h> double round(double x); float roundf(float x); long double roundl(long double x); DESCRIPTION
These functions shall round their argument to the nearest integer value in floating-point format, rounding halfway cases away from zero, regardless of the current rounding direction. 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 rounded integer value. 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 round(), roundf(), and roundl() shall return the value of the macro +-HUGE_VAL, +-HUGE_VALF, and +-HUGE_VALL (with the same sign as x), respectively. ERRORS
These functions may fail if: Range Error The result overflows. 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. SEE ALSO
feclearexcept() , fetestexcept() , the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for Mathematical Functions, <math.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 ROUND(P)

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NEARBYINT(P)						     POSIX Programmer's Manual						      NEARBYINT(P)

NAME
nearbyint, nearbyintf, nearbyintl - floating-point rounding functions SYNOPSIS
#include <math.h> double nearbyint(double x); float nearbyintf(float x); long double nearbyintl(long double x); DESCRIPTION
These functions shall round their argument to an integer value in floating-point format, using the current rounding direction and without raising the inexact floating-point exception. 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 rounded integer value. If x is NaN, a NaN shall be returned. If x is +-0, +-0 shall be returned. If x is +-Inf, x shall be returned. If the correct value would cause overflow, a range error shall occur and nearbyint(), nearbyintf(), and nearbyintl() 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. SEE ALSO
feclearexcept() , fetestexcept() , the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for Mathematical Functions, <math.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 NEARBYINT(P)

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