Round to the nearest integer value.
#include <math.h>
long long llround (x)
double x;
long long llroundf (x)
float x;
long long llroundl (x)
long double x;
long long llroundd32(x)
_Decimal32 x;
long long llroundd64(x)
_Decimal64 x;
long long llroundd128(x)
_Decimal128 x;The llround, llroundf, llroundl, llroundd32, llroundd64, and llroundd128 subroutines round the x parameter to the nearest integer value, rounding halfway cases away from zero, regardless of the current rounding direction.
An application wishing to check for error situations should set the errno global variable to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these subroutines. Upon return, if errno is nonzero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is nonzero, an error has occurred.
| Item | Description |
|---|---|
| x | Specifies the value to be rounded. |
Upon successful completion, the llround, llroundf, llroundl, llroundd32, llroundd64, and llroundd128 subroutines return the rounded integer value.
If x is NaN, a domain error occurs, and an unspecified value is returned.
If x is +Inf, a domain error occurs and an unspecified value is returned.
If x is –Inf, a domain error occurs and an unspecified value is returned.
If the correct value is positive and too large to represent as a long long, a domain error occurs and an unspecified value is returned.
If the correct value is negative and too large to represent as a long long, a domain error occurs and an unspecified value is returned.