Prompt Retrieval

[SoloCDM]

How do I retrieve a number from the prompt?  How would I retrieve an
alpha character from the prompt?  How do I use them in a script?

Do I need to do anything else to the attached script to make it work
with a number from the prompt?

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#!/usr/bin/perl -w
#

$adjustment = $@;
$mequa = (1<<16)*$adjustment/.0864;
print "$mequa\n";