How to convert float to int according to the current rounding direction?

Question

How to convert float to int according to the current rounding direction?

There are the lrint and llrint functions (C11, 7.12.9.5). However, their return values have types long int and long long int. Why there is no version for int?

Answer 1

Maybe because int is quite small and you can easily write such a function yourself.

int irint(double x)
{
    #if (LONG_MAX > INT_MAX && LONG_MIN < INT_MIN)
    long result = lrint(x);
    #else
    long long result = llrint(x);
    #endif

    if(result > INT_MAX || result < INT_MIN) 
    {
        feraiseexcept(FE_INVALID);
        return 0;
    }
    return (int)result;
}