子函数引用（functions ref.ed）

############不引用子函数################

@a=("A","b","c");
@b=("D","E","F");

sub pritncontent{

my(@letter1,@letter2)=@_;

print "@letter1\n";
print "@letter2\n";
}

&pritncontent(@a,@b);

###############引用子函数#####################

@a=("A","b","c");
@b=("D","E","F");

sub pritncontent{

my($letter1,$letter2)=@_; #引用后这里必须是$作为引用

print "@$letter1\n";
print "@$letter2\n";
}

&pritncontent(\@a,\@b);