If you are using a Windows machine and your function is in a DLL, you could also use Win32::API:
use Win32::API ();
my $Get_Temperature = Win32::API->new(
'mydll', 'float Get_Temperature()',
);
my $isThisHot = Win32::API->new(
'mydll', 'BOOL isThisHot(int)',
);
my $temp = $Get_Temperature->Call();
my $hot = $isThisHot->Call($temp);
or
use Win32::API ();
Win32::API->Import('mydll', 'float Get_Temperature()');
Win32::API->Import('mydll', 'BOOL isThisHot(int)');
my $temp = Get_Temperature();
my $hot = isThisHot($temp);
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