I am facing some sifficulties in understanding use of @_ in perl subroutines. @_ is a default array in which arguments passed to a subroutine are stored. Right, then why not use this staement for getting those arguments

my $a=@_ Why we use shift? look at this line of code.. 
abc(3271);
sub abc{
my $a=shift; #what is it? why are we shifting??
}

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In reply to difficulty in understanding use of @_ and shift in a subroutine by masood91

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