On 2/8/10, 7 <7stud.7s...@gmail.com> wrote:
> On 2/8/10, 7 <7stud.7s...@gmail.com> wrote:
>> On 2/8/10, Chris Coggins <cacogg...@cox.net> wrote:
>>> What is the proper syntax for a comparison at the end of a subroutine to
>>> stop the script if a certain variable is "0" or ''?
>>>
>>> sub routine{
>>> (get data and process it)
>>> if $varA = '' || $varA = "0" {
>>> (stop script, print error message to user)
>>> }
>>> else{
>>> (continue with script)
>>> }
>>>
>>
>> if ($varA = '' || $varA = "0") { #space after 'if'
>> #code
>> }
>> else { #space after 'else'
>> #code
>> }
>>
>
> Rather:
>
> if ($varA eq '' || $varA eq "0") { #space after 'if'
> #code
> }
> else { #space after 'else'
> #code
> }
>
...and you might want to consider:
if (defined $var && ($var eq '' || $var eq '0')) {
#code
}
to handle cases where $var = undef. undef acts like it is a blank
string when used as a string.
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