This will give the answer without the superfluous "B::" prefix: 

use feature qw( say );
use B qw( );

my ($f,$g) = (333,"xyz");
say B::class(B::svref_2object(\$f));
say B::class(B::svref_2object(\$g));

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IV
PV

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Note that this returns the SV *type*. It can return "PV" even if the scalar has no PV. 

use feature qw( say );
use B qw( );

$_ = 333;
"".$_;
$_ = undef;
say B::class(B::svref_2object(\$_));

[download]
PVIV

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This is what the OP asked, but he probably wants to know what the scalar *has*.

In reply to Re^2: Is an SV and IV or a PV or an NV or a UV? How can I tell? by ikegami
in thread Is an SV and IV or a PV or an NV or a UV? How can I tell? by Anonymous Monk

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