Is there a trunc function in C++?

Question

I searched around and couldn\'t find the trunc function for C++. I know I can do this:

int main()
{
    double a = 12.566789;
    cout <<          


        

Answer 1

If your C library is so old that it lacks a trunc function (specified in C99), you can easily implement one based on floor and ceil (specified in C89)

double trunc(double d){ return (d>0) ? floor(d) : ceil(d) ; }