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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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Answer Posted / arun
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"?
Ans:bless $test,$pkg
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