Programming languages | Practice Questions

Multiple choice technology programming languages

What will be output ? my $val = 'x'; print ref($val);

STRING
SCALAR
Empty Value
Not a Reference

Reveal answer Fill a bubble to check yourself

Multiple choice technology programming languages

What will be the output ? my $val = bless {}, 'MyClass'; print ref($val);

TRUE
MyClass
1
Object Reference

Reveal answer Fill a bubble to check yourself

Multiple choice technology programming languages

What will be the size of the @data array ? my $var = ':x:y:z:'; my @data = split(':', $var, -1);

Reveal answer Fill a bubble to check yourself

Multiple choice technology programming languages

What will be the output ? package A; sub new { my $class = shift; return bless {}, $class; } package B; use base 'A'; sub foo { return 'blah'; } package main; my $obj = B->new(); print $obj->foo(), "\n";

blah
Empty String
Can't locate object method "new" via package "B"
None of the above

Reveal answer Fill a bubble to check yourself

Multiple choice technology programming languages

What will be the value of $keys ? my $var; if (exists $var->{key1}->{key2}) { $var->{key1}->{key2} = 1; } my $keys = keys(%{$var});

code will fail
2
1
undef

Reveal answer Fill a bubble to check yourself

Multiple choice technology programming languages

What will be the output ? my $str = 'a\b\n'; print $str;

ab(newline)
a\b\n
a\b(newline)
a\b\n

Reveal answer Fill a bubble to check yourself

Multiple choice technology programming languages

What will be the value of $str ? my $str = '112133'; $str =~ s/(.)\1/$1/g;

112133
1233
1213
12133

Reveal answer Fill a bubble to check yourself

Multiple choice technology programming languages

What will the contents of @b array ? my @a = (10, 5, 1); my @b = sort @a;

(1, 5, 10)
(1, 10, 5)
(10, 5, 1)
(5, 10, 1)

Reveal answer Fill a bubble to check yourself

Multiple choice technology programming languages

Sample Code Code: INSERT INTO names VALUES ('John') How do you use the DBI module to execute the above SQL statement? Assume $dbh is the return value from DBI->connect.

my $statement = $dbh->execute("INSERT INTO names VALUES ('John')");
my $statement = $dbh->run("INSERT INTO names VALUES ('John')");
my $statement = $dbh->prepare("INSERT INTO names VALUES ('John')"); $statement->execute;
my $statement = $dbh->sql("INSERT INTO names VALUES ('John')"); $statement->execute;

Reveal answer Fill a bubble to check yourself

Multiple choice technology programming languages

What will be the output ? my $pattern = '.*'; $str =~ /(\Q$pattern\E)/;

any number of any characters
any number of any characters surrounded by Q and E
literally \Q.*\E
literally .*

Reveal answer Fill a bubble to check yourself

Tag: programming languages

Questions Related to programming languages