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A prototype tells declare what types of arguments the subroutine should get.
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my $a=5;
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my $b=6;
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my $c=7;
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@list=(100,200,300);
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sub myadd($$) { # myadd requires two scalar arguments
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my($x, $y)=@_;
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print $x + $y,"\n";
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}
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myadd($a, $b); # Okay
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myadd(5, 4); # Okay
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