Sams Teach Yourself Perl in 24 Hours

Workshop

Quiz

1:	Variables are interpolated inside qq quotes. True False
2:	What value is stored in $c after running the following code? $a=6; $a++; $b=$a; $b−−; $c=$b; 6 7 8
3:	Concatenation can be performed only with the concatenation operator (.). True False

Answers

A1:	a. qq behaves in every way like a pair of double quotation marks. This means it can interpolate variables.
A2:	a. $a is set to 6. $a is then incremented to 7, and assigned to $b. $b is decremented to 6, and assigned to $c.
A3:	b. Remember from Hour 1, in Perl, There Is More Than One Way To Do It (TIMTOWTDI). Concatenation can be performed by including two (or more) scalars in a double-quoted string, as follows:

qq($a$b$c);

Activities

• Write a short program that prompts the user for ...