--On Thursday, September 25, 2003 20:40 -0400 Dan Anderson <[EMAIL PROTECTED]> wrote:
First, thank you for your help. Second, please bear with me as I'm a perl noob.
I assume that $_ is the last thing gotten by <STDIN>.
Nope. ;-) $_, in the context listed in his example, is the value of the current element of the array the loop is looping over. The array just happens to be <STDIN>.
will regexes always default to using $_? I think that's right, but when I try:
Yes, regexes always default to $_.
while (!(<STDIN> =~ /QUIT/)) { push @stack, $_; } print @stack;
it doesn't print anything (although it compiles).
You are now using a boolean value for the test in the while loop. (Eg: whether the test was successful.) Therefore the $_ trickery doesn't apply, and $_ stays whatever it was before the loop. (I think. Regardless it is no longer the last line read from <STDIN>.)
So I typed use warnings; at the top and I get a lot of errors about using an uninitialized variable (@stack). Now I assume that @stack comes into scope as local to that while loop, but typing:
Actually, it would come into scope as a global.
my @stack; our @stack; local @stack;
Before the loop do nothing. Am I missing something?
Should they do anything? (Besides define @stack, and disabling the warning since you have now defined it explicitly.) All they say is to define @stack in a smaller scope than global.
Daniel T. Staal
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