As is typical for Perl, there's more than one way to do it.

You can use it in the list of arguments to print:

print "Result: ", $object->function_call(), "\n";
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You can concatenate it as a string into a single argument to print:

print "Result: " . $object->function_call() . "\n";
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There is also a "trick" you can use to evaluate a function in the middle of a quoted section of text:

print "Result: @{ [ $object->function_call() ] }\n";
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This causes Perl to create an anonymous array (the square brackets) with the results of the function and immediately dereference it to an array ( the @{ } part ). Within double-quotes, that array is joined with spaces and inserted into the string.

That extra formatting is often a nice touch versus the other options above, though some people think it's clearer to do something like this:

print "Result: " . join(" ", $object->function_call() ) . "\n";
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