Returns a Float converted from
num. It is equivalent to prec(Float).
/*
* call-seq:
* num.prec_f => Float
*
* Returns a +Float+ converted from _num_. It is equivalent
* to <code>prec(Float)</code>.
*/
static VALUE
prec_prec_f(x)
VALUE x;
{
VALUE klass = rb_cFloat;
return rb_funcall(x, prc_pr, 1, klass);
}