What is the difference between require and use?

$b = $a++ + ++$a; What is the value of $b?

what is the output of $x'AGAAA'; $x=~tr/AG/C/ds; print $x;

Which will remove a cookie?

How can you get the current postion of the file?

How can I read character by character from a file?

Which is true about dereferencing?

In Perl, a floating-point scalar value consists of the following? (check all that apply)

Define a sample perl hash of arrays using the code?

State variables maintain their state and they do not get _____ upon multiple calls of the subroutines?

Which are special file handles?