Answer to Question #22426 in Perl for Sandeep Saxena

Question

Ques 1:
What is -> Symbol in Perl?

a) '->' symbol is used to refer hash values

b) In object oriented PERL the arrow -> symbol is used for creating or accessing a particular object of a class

c) Arrow operator -> is used for dereferencing references to array or hash

e.g $arr = ['1', '2' ,'3', '4'];

To retrieve the value of first element:

$val = $arr->[1];

d) All of the above are correct


Ques 2:
How do you open a file for writing?

a) open (”FH”, “>filename.dat”) || die “Can’t create the file\n”; Later use FH to perform all file related operation.

b) open (”FH”, “<filename.dat”) || die “Can’t create the file\n”; Later use FH to perform all file related operation.

c) open (”FH”, “filename.dat”) || die “Can’t create the file\n”; Later use FH to perform all file related operation.

d) All are same.

Answer 1

Question 1:The correct answer is b).If you have an object $a of class MyClass, and classMyClass has property "prop", and method "meth", then one
can access to them as follows:
$a->prop
$a->meth()
Question 2:
The correct answer is a), where symbol ">"is used.
In the case b), with symbol "<" file will beopened for reading,
while case c) is incorrect.