Lab 11, Part 3
--------------

This is the second version of the program that converts 'three four one' to 341. It 
was marked out of 4. 

It was a gift. I gave you the answer to the previous version in 
   http://www.cs.ucc.ie/~dgb/courses/pwd/solutions/lab10.txt

The new solution looks like this:

    Get the user's input (a string)
    Explode it into an array called $words

    $word_values = array('zero' => 0, 'one' => 1, 'two' =>   2, ...);   // NEW 
    $answer = 0;
    $exp = count( $words );
    foreach ( $words as $word )
    {
        $num = $word_values[$num]; // NEW (replaces a massive if-statement)
        
        $count--;
        
        $answer += pow( 10, $exp ) * $num;
    }
    echo $answer;
    
1) Obviously, you scored 0 if yours didn't compile or if you still had the if-statement
   or if it gave wrong answers.

2) Most of you scored 4 out of 4. 
   As I mentione dlast time, there is a solution that avoids count and pow - but since
   you were penalised (1 mark) last time for not finding that solution, I did not dock 
   any marks this time.
   If you lost a mark, it was usually because of some especial inefficiency in your
   program.

Lab 11, Part 4
--------------

This was the DNA program. It was marked out of 6. A solution was discussed in a lecture.