Re: Double to string?

[Sisyphus]

Nitin Madnani wrote:
Hi Everyone
First, I want to thank all you guys for all the great advice in the past !!
Here's another question :
I can use a double in perl as a hash key and perl automatically converts 
it to a string and uses it right? How do I do the same in my C code, i.e,

I have this in perl space:
$x = -1e100;
..... some mathematical manipulations on $x
$hash{$x}++;
I have the equivalent double 'x' in my C code. And I want to check 
whether the key 'x' exists in the hash. For that I need to explicitly 
convert 'x' to a string value, correct? How do I do that ?

In addition to the answers you've received already, there's also a way 
of doing it that makes use of the same duplicity that perl exploits:

use warnings;
use strict;
use Inline C => Config =>
    BUILD_NOISY => 1;
use Inline C => <<'EOC';
void foo(SV * a) {
     double d = (double)SvNV(a);
     char * str = (char *)SvPV_nolen(a);
     printf("%f %s\n", d, str);
}
EOC
my $double = 1234.78901;
foo($double);
__END__
Cheers,
Rob