From: Dinakar <Desai.Dinakar@...>
Date: 2001-12-18T11:16:33+09:00
Subject: [ruby-talk:28829] Re: what is wrong with this code- never Mind figured out

I figured it out.
Sorry for all the trouble.

Dinakar


Dinakar wrote:

> Hello:
>
> I am new to Ruby. I am just playing around and trying to write code from C into
> Ruby.
> Following error message is code in Ruby and then in C. Can someone tell me what
> is wrong with Rubycode. C code works fine where as Ruby code give error.
> Error message as follows:
> move ring 1 from peg a to peg c
> move ring 1 from pega to peg b
> ./array_test.rb:5:in `towers': stack level too deep (SystemStackError)
>         from ./array_test.rb:9:in `towers'
>         from ./array_test.rb:9:in `towers'
>         from ./array_test.rb:9:in `towers'
>         from ./array_test.rb:9:in `towers'
>         from ./array_test.rb:9:in `towers'
>         from ./array_test.rb:9:in `towers'
>         from ./array_test.rb:9:in `towers'
>         from ./array_test.rb:9:in `towers'
>          ... 2693 levels...
>         from ./array_test.rb:9:in `towers'
>         from ./array_test.rb:9:in `towers'
>         from ./array_test.rb:9:in `towers'
>         from ./array_test.rb:18
>
> ================
> Ruby  code
> #!/usr/bin/env ruby
>
> def towers( n, a, b, c)
>   @n = n.to_i
>   if (@n == 1)
>   printf "move ring %d from peg %s to peg %s\n", @n, a, c
>   return
>   end
>   towers((@n -1), a, c, b)
>   printf "move ring %d from peg%s to peg %s\n", @n, a, c
>   towers((@n -1), b, a, c)
>   return
> end
> n = 5
> a = 'a'
> b = 'b'
> c = 'c'
> towers(n, a, b, c)
>
> ==============
> C code:
> #include <stdio.h>
> void towers(int n, char a, char b, char c)
> {
>  if (n == 1)
>  {
>   printf("move ring %d from peg %c to peg %c\n", n, a, c);
>   return ;
>  }
>  towers(n - 1, a, c, b);
>  printf("Move ring %d from peg %c to peg %c\n", n, a, c);
>  towers(n - 1, b, a, c);
>  return;
> }
> main()
> {
>     int n = 5;
>     char a= 'a';
>     char b = 'c';
>     char c = 'c';
>  towers(n, a, b, c);
> }
> ================
>
> Thank you.
>
> Dinakar
> mnopq@mayo.edu