lround(3)

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Domain error: x is a NaN or infinite, or the rounded value is too large

An invalid floating-point exception (FE_INVALID) is raised.

NAME

lround, lroundf, lroundl, llround, llroundf, llroundl - round to nearest integer

SYNOPSIS

bash

#include <math.h>

bash

long lround(double \nx\n);\n
\nlong lroundf(float \nx\n);\n
\nlong lroundl(long double \nx\n);

bash

long long llround(double \nx\n);\n
\nlong long llroundf(float \nx\n);\n
\nlong long llroundl(long double \nx\n);

All functions shown above:

bash


\n
    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

DESCRIPTION

These functions round their argument to the nearest integer value, rounding halfway cases away from zero, regardless of the current rounding direction (see fenv(3)).

Note that unlike the round(3) and ceil(3), functions, the return type of these functions differs from that of their arguments.

RETURN VALUE

These functions return the rounded integer value.

If x is a NaN or an infinity, or the rounded value is too large to be stored in a long (long long in the case of the ll* functions), then a domain error occurs, and the return value is unspecified.