What rules must be followed by modules in perl.

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Explain ivalue?

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while (my ($key, $value) = each(%ENV)) { print "$key - $value\n"; } What does the above sample code produce? What function do you use for reading a list of files within a directory? my %hash = ( 'hi' => {'hello' => 'all'}, 'bye' => {'later' => 'gone'} ); print $hash{'hi'}; What is printed when the above code is executed? sub new { my $pkg = shift; my $test = {'name' => shift;}; ???? return $test; } Which one of the following replaces "????" in the above code in order to cause the function new to return an object of type "Test"? while (<STDIN>) { ???? print "$_\n"; } Which one of the following statements causes the above code to strip all whitespace from the end of all lines of input and to print the resulting lines to standard output while (my ($key,$value) = each(%hash)) { print "$key - $value\n"; delete $hash{$key}; } open(FILE,"<file.dat"); my $data = ''; { local $/ = undef; $data = <FILE>; } close(FILE); my $foo = 21; $foo <<= 5; $foo >>= 4; print $foo; @arr = (1,2,3); {local $" = "\n"; print "@arr\n"; } my $line = "Hello World"; substr($line,5,2) = "abc"; print $line; Why is sprintf rarely used in perl in comparison to similar (or the same) functions in other languages? my $subRef = sub {print shift;}; How is the subroutine above called with one parameter? How can the values of an associative array be placed in sorted order in a new array? What function is often necessary for building data structures to be passed to low-level routines such as ioctl and fcntl? sub foo { if (shift(@_) > 0) { shift; } } print foo(10,5); print foo(-10,5); What does the above sample for (my $i = 1; $i <= 3; $i++) { print 1..$i; print "\n"; } my $data = 5**3 * 12,2+2; print $data; sub foo { my $value = shift; if ($value) { print 1; shift; } else { return shift(@_) + 3; } } print foo(10,20); What is printed as the result of executing the above code? $var = 20; sub s1 { print "$var "; } sub s2 { local $var = 10; s1;} sub s3 { my $var = 30; s1;} s3; s2; s1; On systems that record file ownership, how may the owner of a file be identified? Which one of the following sets $y to be a copy of $x with every occurrence of foo changed to bar? Which one of the following is an array literal that represents a 4-element array containing the numbers 1, 4, 2, and 6? sub foo {2*shift || 'x';} printf ("%s %s %s", foo(5),foo(0),foo(-5)); What does the above sample code print? Suppose $x contains a number. Which one of the following statements sets $y to be a string containing the octal value of $x?

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Differentiate between use and require, my and local, for and foreach and exec and system

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Mention the difference between die and exit in Perl?

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What is the main function of cookie server?

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What are the various perl data types based on the context?

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What are the logical operators used for small scale operations? Explain them briefly.

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What does the’$_’ symbol mean?

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What are the benefits of perl in using it as a web-based application?

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how to install a package in perl ????

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Explain the difference between use and require?

5 Answers   Aspire,

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