0
Alien head

programming languages Online Quiz - 225

Description: programming languages Online Quiz - 225
Number of Questions: 20
Created by:
Tags: programming languages
Attempted 0/20 Correct 0 Score 0

What do the variable $! contains?

  1. Page length of a particular output file

  2. The input end-of-line character

  3. The return code returned by a command called by the system function.

  4. The error code generated by a system library routine.


Correct Option: D

What do the variable $? contains?

  1. Page length of a particular output file

  2. The input end-of-line character

  3. The return code returned by a command called by the system function.

  4. The error code generated by a system library routine.


Correct Option: C

Which line of code represents the correct syntax to establish a reference to a database handle?

  1. $dbh = DBI::connect("dbi:mysql:myPhoneBook");

  2. $dbh = DBD:->connect("dbi::mysql::myPhoneBook");

  3. $dbh = DBD::connect("mysql:dbi:myPhoneBook");

  4. $dbh = DBI->connect("dbi:mysql:myPhoneBook");


Correct Option: D

Consider the following program code: $y = 1; $x = 2; $z = 3; do { print ($y ); } while ($y eq 2); do { print ($x ); } until ($x eq 2); print ($z ); What is the result of executing this program code?

  1. The code will output the following:123

  2. The code will output the following: 3

  3. The code will output the following:23

  4. The code will output the following: 321


Correct Option: A

Consider the following program code: $x = 10; LOOP: while ($x < 15) { print ($x ); if ($x >= 14 && $x <= 20) { $x += 2; redo LOOP; } else { $x++; }} What is the result of executing this program code?

  1. The code will output the following: 11 12 13 14 15 16 17 18 19

  2. The code will output the following: 10 11 12 13 14 16 18 20 22

  3. The code will output the following: 10 11 12 13 14 16 18 20

  4. The code will output the following: 10 11 12 13 14 15 16 17 18 19 20


Correct Option: B

Consider the following program code: @array = (10, Masami, 10..13, Niklas); for ($i = 1; $i < $#array; $i++) { print($array[$i] ); } What is the result of executing this program code?

  1. The code will output the following: Masami 10 11 12 13

  2. The code will output the following: 10 Masami 10 11 12 13

  3. The code will output the following: 10 Masami 11 12 13 Niklas

  4. The code will output the following: Masami 10 11 12 13 Niklas


Correct Option: A

What is the value of @list at the end of the following program? #!/usr/local/bin/perl @list=(1,2.3); &testsub(*list); Sub testsub{ Local (*sublist)[email protected]_; $sublist[1] = 5; }

  1. (1,2.3)

  2. (1,5,3)

  3. Will produce error

  4. (1,4,3)


Correct Option: B

Within Perl, which operator is used to change the working directory?

  1. cd

  2. chdir

  3. pwd

  4. wd


Correct Option: B

Which file test can be done to see if a file exists and has a nonzero size?

  1. -s

  2. -l

  3. -S

  4. -k


Correct Option: A

Which Perl function can be used to launch a child process to run a program?

  1. split

  2. spin

  3. fork

  4. system


Correct Option: D

Which file test can be done to see if a file is a symbolic link?

  1. -s

  2. -l

  3. -S

  4. -k


Correct Option: B

Your script has just read in a variable from the keyboard and you want to strip that variable of the newline character that came in. What operator should you use to perform this operation?

  1. tidy

  2. trim

  3. chomp

  4. slim


Correct Option: C

Suppose the variable $var has the value abc123abc . What is the value of $var after the following substitution?

  1. $var=~ s/(\d+)/ $1*2 /e ;

  2. “abc”

  3. It will produce error

  4. “ABC123ABC”


Correct Option: D

Which function can be used to print a message to standard error, but not quit the program?

  1. warn

  2. alert

  3. tell

  4. notifiy


Correct Option: A

Consider the following lines of code: @array1 = ("apples", "oranges", "pears", "plums"); foreach (@array1) {print "$_\n"}; What is the result of these lines of code?

  1. applesorangespearsplums

  2. apples oranges pears plums

  3. apples

  4. apples oranges pears plums


Correct Option: D

Consider the following program code @array= (“Y”,”W”,”X”); @array=sort(@array); unshift(@array , ”Z”); print($array[0]); What is the output of this code

  1. W

  2. X

  3. Y

  4. Z


Correct Option: D

Assume that $var has the value hello . What is the value of the following sting?q (It’s time to say $var);

  1. It’s time to say $var

  2. It’s time to say hello

  3. None

  4. Both


Correct Option: A

You want to close the directory handle EVAN. Which of the following should you use to accomplish this?

  1. close EVAN;

  2. closedir EVAN;

  3. close_directory EVAN;

  4. none of the above


Correct Option: B

Within a loop, which operator immediately ends execution of the loop?

  1. next

  2. last

  3. redo

  4. leave


Correct Option: B

Which file test can be done to see if a file has the sticky bit set on it?

  1. -s

  2. -l

  3. -S

  4. -k


Correct Option: D
+ View questions