From: John Joyce <dangerwillrobinsondanger@...>
Date: 2007-03-25T09:16:08+09:00
Subject: Re: Ruby with C

You mean C++ class?
C doesn't have objects or classes.
On Mar 25, 2007, at 8:54 AM, Harold Hausman wrote:

> On 3/25/07, dogwasstar@hotmail.com <dogwasstar@hotmail.com> wrote:
>> Here is the C file
>>
>> static VALUE t_bit(VALUE self, VALUE obj)
>> {
>>     VALUE n;
>>
>>     n = NUM2INT(obj);
>>     printf("Fun %d", INT2NUM(n));
>>     return Qnil;
>> }
>>
>>
>
> Hi.
>
> By putting the variable 'n' through the INT2NUM macro as you pass it
> into printf you're re-converting it back into a Ruby VALUE which is
> not what you want to do. It will give you unpredictable (or at least
> more-difficult-to-predict ;) ) results...
>
> Assuming you just want to print the value of 'obj' as an integer, you
> should probably declare 'n' as an integer instead of as a VALUE, and
> use the NUM2INT (as you have) to convert the Ruby VALUE 'obj' into a
> plain int. Then you can pass it straight into printf (as you would
> with any other int) ... no need for INT2NUM there.
>
> hope that helps,
> -Harold
>