Just to illustrate hdb's point that Perl's arrays are dynamic — and also that Perl supports negative indexing, which C doesn't like (other than a negative index of -1 for some reason, IIRC).

>perl -wMstrict -le
"my @array;
 print 'elements in array: ', scalar @array;
 ;;
 $array[1_000_000] = 42;
 print 'elements in array: ', scalar @array;
 ;;
 $array[-2] = 41;;
 print qq{elements at end of array: @array[ -2 .. -1 ]};
"
elements in array: 0
elements in array: 1000001
elements at end of array: 41 42
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Update: Changed example code.