Hi all,

I have some code that uses Term::ReadKey to get some user input, but 99 times out of 100 when this script is run, it picks the data up from a file instead, and Term::Readkey isn't needed. So I figure why not do away with the dependency, and require Term::ReadKey in when needed.

But the sub that uses it contains a couple of statements like this:

ReadMode 1;
# some stuff
ReadMode 2;

[download]

Intrigued by this - apparently a function call without parentheses - I asked in the CB, and was told that the parentheses are optional for a single param function call. But this test case: 

testcall 1;
testcall(2);

sub testcall
{
    print $_[0];
    print "\n";
}

[download]

fails to compile with:

Number found where operator expected at fcall.pl line 1, near "testcal
+l 1"
        (Do you need to predeclare testcall?)
syntax error at fcall.pl line 1, near "testcall 1"
Execution of fcall.pl aborted due to compilation errors.

[download]

(On AS perl, 5.6.1). Term::ReadKey doesn't appear to use prototypes incidentally.

I'm intrigued - is there a functional difference between ReadMode 1; and ReadMode(1); and if so, what? Or am I being really, really dense?

Thanks.

Update: thanks to duff. I'd sort of always assumed that

callsub();
sub callsub{#dostuff}

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and 
sub callsub(){#dostuff}
callsub();

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were equivalent, and never encountered anything that proved me wrong. I know better now :-)

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In reply to 'function' calls without parentheses by g0n

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