SAMS Teach Yourself Perl in 24 Hours THIRD EDITION

Workshop

Quiz

1:	What's an efficient way to swap the values contained in two scalar variables $a and $b? $a=$b; ($a,$b)=($b, $a); $c=$a; $a=$b; $b=$c;
2:	What does the statement $a=scalar(@array); assign to the variable $a? The number of elements in @array The index of the last element of @array That syntax is not valid
3:	What does the statement $a=@array; assign to the variable $a? The number of elements in @array The index of the last element of @array That syntax is not valid

Answers

A1:	b. The first choice clearly will not work; the value contained in $a is destroyed. Choice c answers the question but requires a third variable to hold the data during the swap. Choice b swaps the data correctly, using no extra variables, and is fairly clear code.
A2: ...