There are two problems with your code: - Assuming SORTD is some form of file-handle, the first time you arrive at the while-loop ($i being equal to 0), the while-loop will totally exhaust the filehandle. All following calls to readline(SORTD) (when $i is incremented and the while-loop is entered again, will just return undef and the while-loop will not even start. Re-entering the loop does not reset the filehandle to the beginning of the file.
- The value of $i remains constant throughout each iteration of the for loop. So the while-loop will see the same value of $i for the whole of the file you are reading.
One more comment: it is more customary to write readline(SORTD) as <SORTD>
CountZero A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James
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