#!/usr/bin/perl -w I have noticed the folling: instead of using (scalar(@arr)) to indicate the number of ellements in an array it is possble to use $#arr. It seems that $# is a value 1 less then the scalar value.

@arr=('A', 'B', 'C', 'D', 'E', 'F', 'G');
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instead of writing:

for(my $i=0; $i<(scalar(@arr)); $i++)
{print"$i $arr[$i]\n";}
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..one could make things little easier by writing:

for(my $i=0; $i<=$#arr; $i++)
{print"$i $arr[$i]\n\n";}
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What is this $# variable really, and is it correct to use it as shown above. I mean could it cause any problems if one uses $#x instead of scalar(x)? What is this