To get the desired result, 

>perl -e"printf(qq{%d\n}, unpack('C', pack('h', 'F')));"
15

[download]

or 

>perl -le"print(hex('F'));"
15

[download]

As you can see, the OP has pack and unpack backwards.

In reply to Re^2: Mysteries of unpack by ikegami
in thread Mysteries of unpack by atypic

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