The problem lies here: 

if ($answer = "n")
{
&start();
}
elsif($answer = "y")
{

[download]
= is used for assignment. == and eq are used for equality testing of numbers and strings respectively. Also, you will want to make your code case insensitive.

The corrected code is: 

$answer = lc($answer);
if ($answer eq "n")
{
&start();
}
elsif($answer eq "y")
{

[download]

Another alternative altogether would be to check $answer with a regex.

In reply to Re: A missleading sub by Mr. Muskrat
in thread Trouble with flow control by eoin

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