CS315

Which statement about comments is false? Select one: a. Comments do not cause any machine language object code to be generated. b. Comments begin and end with /* and */, respectively. c. Programmers insert comments to document programs and improve program readability. d. Lengthy comments can cause poor execution-time performance.

Lengthy comments can cause poor execution-time performance. Correct

Arrays and structures are __________ entities in that they remain the same size throughout program execution. Select one: a.static b.automatic c.register d.dynamic

a. static Correct

If a do...while statement is used, Select one: a.the body of the loop will execute at least once b.the counter must be preincremented if it's also the condition c.an off-by-one error will not occur d.an infinite loop will not take place

a. the body of the loop will execute at least once Correct

Assume int x = 10, y = 20; what will be the value of x & y? (only use one byte to represent the value in binary) a. 0000 0000 b. 0000 0010 c. 1000 0000 d. 0000 1000

a. 0000 0000

Which of the following are examples of arithmetic or relational operators? (Choose all that apply.) a. < b. % c. * d. !

a. < b. % c. * d. !

What shell is used by Linux as the default command interpreter? a. Bash shell b. Korn shell c. Bourne shell Incorrect d. C shell

a. Bash shell

While you are typing a command, you misspell the name of a file you want to specify with the command. Which of the following commands-line key combinations enables you to go back and fix your error? a. Ctrl + b b. Alt + End c. Ctrl + 2 d. Shift + Alt + m

a. Ctrl + b

You have spent the last two hours creating a report in a file and afterwards you use cat to create a new file. Unfortunately the new file name you used was the same as the name you used for the report, and now your report is gone. What should you do next time to prevent this from happening? a. Enter the command, set -o noclobber before you start. b. Enter the cat -s command before you start. c. Always use the cat -m command when you use cat to create a file, because this command checks to see if the file already exists. d. After you created the report file you should have used the chmod a-o command to prevent the file from being deleted or overwritten. Incorrect

a. Enter the command, set -o noclobber before you start.

Which statement about precedence is false? Select one: a. Nested, or embedded parentheses are evaluated last. b. Multiplication has a higher precedence than addition. c. Subtraction has a lower precedence than division. d. Parentheses may be used to force the order of evaluation to occur in any sequence desired by the programmer.

a. Nested, or embedded parentheses are evaluated last.

Which of the following are examples of Linux distributions? (Choose all that apply.) a. SUSE Linux Enterprise b. Mandriva c. Fedora d. Red hat Enterprise Linux

a. SUSE Linux Enterprise c. Fedora d. Red hat Enterprise Linux

You frequently use the command ls -a and want to save time by just entering l to do the same thing. Which of the following commands enables you to set your system to view hidden files by only entering l ? a. alias l=" ls -a" b. set " ls -a" to "l" c. set l to ls -a d. put l= ls -a

a. alias l=" ls -a"

Which of the following will not increment variable c by one? Select one: a. c + 1; b. ++c; c. c += 1; d.c++;

a. c + 1;

Before you make the note in Question 1, you decide to determine Friday's date, so that you can include it in your note. What Linux command can you use to quickly determine Friday's date? a. cal b. date -cal c. weekday d. time -d

a. cal

Which of the following commands works well for menus used in a script? (Choose all that apply.) a. case b. comm c. do d. choose

a. case

To change the log in shell from bash to C shell, you need to type a. chsh then type in the password, then type /bin/csh b. chsh the type in the password, the type \bin\csh c. both a and b are right d. none of them is right Incorrect

a. chsh then type in the password, then type /bin/csh

Which statement is used to skip the remainder of the body of a repetition statement and proceed with the next iteration of the loop? Select one: a. continue b. skip c. proceed d. jump

a. continue

hich is not a repetition statement? Select one: a. continue b. while c. for d. do ... while

a. continue Correct

To view your home directory, you need to type: a. echo "$HOME" b. echo '$HOME' c. echo HOME d. printenv $HOME

a. echo "$HOME"

Another way of display an environment variable PATH is: a. echo $PATH b. echo PATH c. ECHO $PATH d. echo "PATH"

a. echo $PATH

Which of the following commands enables you to view the contents of a file? (Choose all that apply.) a. less b. cat c. grok d. whatis Incorrect

a. less b. cat

Which of the following are valid expressions? (Choose all that apply.) a. let x=5*9 b. let x=y+10 c. let r=128-80 d. let m=12/4

a. let x=5*9 b. let x=y+10 c. let r=128-80 d. let m=12/4

To view the files in current directory, one needs to type: a. ls b. ld c. dir d. dd

a. ls

To see the detail of all files in current directory, one needs to type: a. ls -la b. ls a c. see -all d. none of them are correct

a. ls -la

Your current working directory contains a series of files that start with the word "account" combined with a, b, c, d, and e, such as accounta, accountb, and so on. Which of the following commands enables you to view the contents of all of these files? (Choose all that apply.) a. more account[ a,b,c,d,e ] b. ls account "a -e" Incorrect c. ls acc* d. less account "a,e" Incorrect

a. more account[ a,b,c,d,e ]

You are working with a new colleague who has entered the man command, but who does not know to end the man session to return to the regular command prompt. what keystrokes do you show your colleague to end the man command? (Choose all that apply) a. q b. Alt+s Incorrect c. Shift+Spacebar d. CTRL+ALT+Del

a. q

You are working with a colleague on a script called value that updates several files. You want to test the script, but not update the files. Which of the following commands can you use? a. sh -n value b. trap -u value Incorrect c. test -noupdate value d. set -u value

a. sh -n value

The command line parameter $# represents a. the total number of command line parameters b. the exit status of last command Incorrect c. the PID number of the executing process d. all command line parameters

a. the total number of command line parameters

When you enter the who command, what information do you see? (Choose all that apply.) a. the users on the local system b. the owner of the local system c. list of all authorized users on a system, regardless of whether or not they are logged in d. a listing of all computers on your local network

a. the users on the local system

You have written a shell program that creates four temporary files. Which of the following commands can you use to remove these files when the script has completed its work? a. trap b. grep c. clear d. del

a. trap

A(n) __________ is a location in the computer's memory where a value can be stored for use by a program.

a. variable

Which statement is true about the contents of a correct diamond symbol in a correct flowchart. Select one: a. It must contain an expression that evaluates to zero or one. b. It must contain a condition or expression that can be either true or false. c. It must contain equality operators. d. It must contain relational operators.

b. It must contain a condition or expression that can be either true or false.

After you have typed "let X=100+2*7", then type echo $X, what will you see on the screen:

b. 114

What is the final value of x after performing the following operations? int x = 21; double y = 6; double z = 14; y = x / z; x = 5.5 * y; Select one: a. 5.5 b. 8 c. 5 d. 8.25

b. 8

You have created a series of scripts that use the same environment variables. However, when you run these scripts, some of them do not seem to recognize the environment variables you have set. What is the problem? Select one: a. You are creating too many environment variables, because the maximum number is five. b. You need to use the export command so these variables have global use. c. You must use the home command to make these variables native to your home directory. Incorrect d. Only the system administrator can create environment variables and you should contact her to create the ones you need to use.

b. You need to use the export command so these variables have global use.

In a printf, a backslash is printed by enclosing in quotes Select one: a. // b. \\ c. \ / d. \

b. \\

You work at a law firm with eight other people. All of the eight computers on the firm's network use wireless connections to communicate with one another without a server. This is an example of which of the following? a. a central network b. a peer-to-peer network c. a stand-alone network d. a Telnet spoke network with no hub

b. a peer-to-peer network

You want to store a long listing of your files in a variable called myfiles. Which of the following commands enables you to do this? a. echo ls -l > myfiles Incorrect b. alias myfile="ls -l" c. let ls -l=myfiles d. let ls -l > myfiles

b. alias myfile="ls -l"

To copy a file with the name "Myfile" to a different name as "Myfile2", one needs to use the following command line: a. copy Myfile Myfile2 b. cp Myfile Myfile2 c. cp Myfile2 Myfile d. duplicate Myfile Myfile2

b. cp Myfile Myfile2

Your international company is scheduling a meeting among managers in Canada, the United States, Spain, Swedish, and Hong Kong on the basis of Greenwich Mean Time (GMT). What command enables you to display the current time in GMT? a. time -g Incorrect b. date -u c. cal -t d. hour -g

b. date -u

SSH can be used to a. analyze the security on a UNIX or Linux computer b. log in remotely to another computer on a network c. quite the volume of the sound card d. quickly switch to another user account on the local computer

b. log in remotely to another computer on a network Correct

Which of the following is not a keyword? Select one: a. return b. main c. if d. int

b. main

To create a new directory with the name week03, one needs to type: a. mk week03 b. mkdir week03 c. makedirectory week03 d. create dir week03

b. mkdir week03

________ repetition is sometimes called indefinite repetition. Select one: a. counter-controlled b. sentinel-controlled c. variable-controlled d.none of these

b. sentinel-controlled

The command line parameter $$ represents a. the exit status of last command b. the PID number of the executing process c. the total number of command line parameters d. all command line parameters

b. the PID number of the executing process

The __________ sign is also known as the __________ operator. Select one: a. *, stream manipulator b. &, stream insertion c.=, assignment d.+, assignment

c. =, assignment

Which statement is false. Select one: a. All variable definitions must include the name and data type of each variable. b. Several variables of the same data type may be defined in one definition. c. Variables may be defined anywhere in the body of main. d. All variables must be defined before they are used.

c. Variables may be defined anywhere in the body of main.

A programmer intentionally creates a for-loop with the following for header: for ( ; ; ) The programmer's intent was most likely to create Select one: a divide-by-zero error b. a logic error c.an infinite loop d. a syntax error

c. an infinite loop Correct

For the the following C program, find the value of z in Hexadecimal. int x = 0x4, y = 0x8, z; z = x | y; Select one: a. 0Ah b. 0Dh c. 0Ch d. 0Bh

c. 0Ch

For the following program, what will be the value z? (use decimal to express the value of z) int x = 16, z; z = x >> 4; a. 3 b. 2 c. 1 d. 4

c. 1

For the following c code, what will be the value of z in binary (in one byte)? int x = 5, z; z = ~x; Select one: a. 0000 0000 b. 1000 1000 c. 1111 1010 d. 1010 1111

c. 1111 1010

Evaluate the expression 3 * 4 % 6 + 4 * 5 Select one: a. 32 b. 12 c. 20 d. 16

c. 20

Which of the following is an invalid identifier (variable name)? Select one: a. Test5 b. TEST c. 5Test d._Test

c. 5Test

You have remotely logged into a computer running UNIX or Linux, but you are not certain about which operating system you are using. However, when you display the contents of the variable it shows which operating system a. OPTIND b. OP c. OSTYPE d. OID

c. OSTYPE

If grade has the value of 60 what will the following code print? if ( grade >= 60 ) puts( "Passed" ); Select one:

c. Passed

You are in a hurry and have just executed a command to print the contents of a file and you decide you want another copy of the printout. what key sequence can you use to repeat the last command, which was used to print the file? a. Press Alt+P b. Press the Backspace key c. Press the up arrow key once d. Press Shift+R

c. Press the up arrow key once

Your organization routinely uses scripts, but as some employees have left, there are scripts that contain only command lines and no one is certain of their purpose. What steps can be taken to ensure a way for others to know the purpose of a script? a. Use the whatis command to create and save new documentation for scripts. b. Create text documentation of scripts and use the scriptdoc command to organize and Create text documentation of scripts and use the scriptdoc command to organize and display the documentation. Incorrect c. Require that script writers place comment lines inside the scripts using the # symbol to begin each comment line. d. Require that scripts be named using the descriptive sentence naming function in UNIX/Linux.

c. Require that script writers place comment lines inside the scripts using the # symbol to begin each comment line.

You have created a script for use by your entire department in a commonly accessed directory. Only you are able to run the script, which works perfectly. Which of the following is likely to be the problem? a. There are two kinds of scripts, universal and private.You have created a private script and need to convert it to universal. b. You did not designate to share ownership of the script. c. You did not give all users in your department execute permission for that script. d. You did not link the script.

c. You did not give all users in your department execute permission for that script.

Which of the following is not a valid escape sequence? Select one: a. \\ b. \" c. \~ d. \n

c. \~

Lines beginning with a # are processed Select one: a. at execution time. b. at compile time. c. at preprocessor time. d. at postprocessor time.

c. at preprocessor time. Correct

You need to type in a line of text to the end of a file called Annual _Report. Which of the following commands enables you to add the text ?a. add = Annual_Report b. append < Annual_Report c. cat >> Annual_Report d. append @ Annual_Report

c. cat >> Annual_Report Correct

To move one level up in the directory tree, one needs to us the following command line: a. cd -next b. cd -up c. cd .. d. cd -next

c. cd ..

From programming language point of view, shell is a a. both a and b b. compiled type high level language c. interpreted type high level language d. none of the above

c. interpreted type high level language

Which of the following must every C program have? a. <stdio.h> b. #include c. main d. /*

c. main

You have forgotten the purpose of the -n option in the cat command. Which of the following can you enter at the Linux command line to find out what the -n option does when used with cat? a. what's cat -n b. ? cat Incorrect c. man cat d. find -n for cat

c. man cat

Using an incorrect relational operator or using an incorrect final value of a loop counter in the condition of a while or for statement is a frequent cause of __________errors. Select one: a. divide-by-zero b. syntax c. off-by-one d.compilation

c. off-by-one Correct

What command can you use to view the environment and configuration variables already configured on your system? a. let-all b. var c. printenv d. envar

c. printenv

You have written a script, but when you run it there is an error. Which of the following commands can you use to debug your script? (Choose all that apply.) a. ./ -d Incorrect b. debug -all Incorrect c. sh -x d. sh -v

c. sh -x d. sh -v

In your document files, you often put the date you created the file and the date you last modified it in the last two lines of the file. Which command can you use to look at only the last two lines of the file, called project? a. show -l 2 project b. display project -2 c. tail -n 2 project d. less/2 project

c. tail -n 2 project

A shell script is basically a a. binary file b. both a and b c. text file d. neither a or b

c. text file

The command line parameter $? represents a. the total number of command line parameters Incorrect b. the PID number of the executing process c. the exit status of last command d. the name of the shell

c. the exit status of last command

To remove a local variable that has the name of "W", one needs to type: a. del W b. remove W c. unset W d. rm W Incorrect

c. unset W

To find the number of users currently online, which is the correct command line to do the task? a. who | wc -c b. who : wc -l c. who | wc -l d. who ; wc -l

c. who | wc -l

Your boss drops to your office in a hurry to ask you to attend a meeting at 10:30 on Friday morning and you cannot find a pen to make a reminder. What Linux command can you use to make a quick note to store in a file called Meeting? a. more: Meeting b. cat > Meeting c. Meeting >> note d. record = Meeting

cat > Meeting

Which statement is false? Select one: a. Enumeration constant values can be set automatically. b. An enumeration is a set of integer constants represented by identifiers. c. Assigning a value to an enumeration constant when creating an enumeration type causes a syntax error. d. Assigning a value to an enumeration constant after it has been defined is a syntax error.

d. Assigning a value to an enumeration constant after it has been defined is a syntax error.

Which statement about C arithmetic is false?https://quizlet.com/111969926/flashcards# Select one: a. 6 % 3 yields 0 b. 7 % 3 yields 1 c. 6 / 3 yields 2 d. 5 / 2 yields 2.5

d. 5 / 2 yields 2.5

To create a local variable Cat and assigned MEOW to it, you need to type: a. Cat = "MEOW" Incorrect b. Cat = MEOW c. Cat=$MEOW d. Cat=MEOW

d. Cat=MEOW

Which of the following is the UNIX distribution originally developed through AT&T Bell Labs? a. SUSE Incorrect b. BSD c. TurboUNIX d. System V

d. System V

What error is in the following script code? case "selection" in " i ") ./listscript ;; " ii ") ./numberscript ;; " iii ") ./findscript ;; esac a. There should be no double quote marks in the code. b. The code must end with the statement,"out". c. All references to ;; should be replaced with a back quote. d. There should be a dollar sign in front of selection, as in "$selection"

d. There should be a dollar sign in front of selection, as in "$selection"

You share a Linux computer with a coworker. What is the best way to exit your Linux session when you are done? a. Turn off the computer using the on/off switch b. Ctrl+Alt+Del c. Use the over >> out command d. Use a GUI menu option to log out or enter an approprite command for the shell you are using, such as exit or logout (if there is no GUI desktop in use)

d. Use a GUI menu option to log out or enter an approprite command for the shell you are using, such as exit or logout (if there is no GUI desktop in use) Correct

You only have to enter the name of a script to have it run, such as entering myscript. What setting enables you to do this? a. You have set the SCRIPT environment variable to 1 instead of the default 0. b. Right after you logged in you entered setup scripts. c. The first line in your scripts is always run, which enables scripts to be run in this way. d. You have placed the directory from which you run the scripts in your PATH variable.

d. You have placed the directory from which you run the scripts in your PATH variable.

The command line parameter $@ represents a. the exit status of last command b. the total number of command line parameters c. the PID number of the executing process Incorrect d. all command line parameters

d. all command line parameters

What is the default shell in most Linux today? a. c shell b. bourne shell c. korn shell d. bash shall

d. bash shall

You have been entering lots of commands and now your terminal windows is cluttered will all kinds of activity. What command can you use to clear your window of the clutter? a. clean b. freshstart c. new d. clear

d. clear

________ repetition is sometimes called definite repetition. Select one: a. sentinel-controlled b. variable-controlled c. none of these d. counter-controlled

d. counter-controlled Correct

When you type for wood maple spruce oak pine at the command line and then press Enter, what should you type next at the > prompt? a. go b. term c. fi d. do

d. do

All functions in the math library return the data type __________. Select one: a. int b. long c. float d. double

d. double

You are currently in the source directory, which is the new directory you have just created for storing and running your scripts.You want to make certain that the source directory is in your default path.Which of the following commands enables you to view the current default path settings? a. cat PATH b. show path c. sed PATH! d. echo $PATH

d. echo $PATH

Strings can not Select one: a. be initialized using string literals b. be initialized with initializer lists c. be treated as arrays of characters d. end in a character other than the null character

d. end in a character other than the null character Correct

For which of the following logic structures used within a script is fi the final line for that logic structure? (Choose all that apply.) a. for b. loop c. case d. if

d. if

You haven't changed your user account password for several months and now decide to create a new password. Which of the following commands should you use? a. changepass b. newpass c. cat -p d. passwd

d. passwd

Which expression raises x to the y power? Select one: a. x pow y b. x ** y c. x ^ y d. pow( x, y )

d. pow( x, y ) Correct

To display an environment variable SHELL, you use the following command: a. display SHELL b. print SHELL c. printenv SHELL d. printenv $SHELL

d. printenv SHELL

Which of the following statements correctly prints "Passed" if the student's grade is greater than or equal to 60 and "Failed" if the student's grade is less than 60? [The quotes, of course, should not print.] Select one: a. grade >= 60 : puts( "Passed " ) ? puts( "Failed " ); b. printf( "%s\n", grade >= 60 : "Passed" : "Failed" ); c. grade >= 60 ? puts( "Passed " ) ? puts( "Failed " ); d. printf( "%s\n", grade >= 60 ? "Passed" : "Failed" );

d. printf( "%s\n", grade >= 60 ? "Passed" : "Failed" );

Which statement prints "hi" on the screen? Select one: a. none of the above b. puts "hi"; c. put "hi"; d. puts( "hi");

d. puts( "hi");

This is your first day on the job as a Linux server administrator and your boss gives you the password for root. What is root? a. the name of a practice user account b. a program used to determine the users on a linux server and what they are doing c. a general directory name d. the administrative account that has a complete access to a UNIX/Linux system.

d. the administrative account that has a complete access to a UNIX/Linux system

Arrays are data structures consisting of related data items of the same __________. Select one: a. subscript b. sort order c. element d. type

d. type Correct

The C compiler ignores __________ characters like blanks, tabs and newlines used for indentation and vertical spacing. Select one:

d. whitespace

If x = 3, which of the following sets x to 7? Select one: a.x + 4 = x; b. x =+ 4; c. x *= 4; d. x += 4;

d. x += 4; Correct

Which statement is true? Select one: a. EOF must have the value 1 on all C systems. b.EOF is a symbolic constant defined in the <symbol.h> header file. c. EOF is a symbolic variable defined in the <stdio.h> header file. d.EOF is a symbolic integer constant defined in the <stdio.h> header file.

d.EOF is a symbolic integer constant defined in the <stdio.h> header file.

Which of the following will generate an error? Select one: a. if ( answer == 7 ) puts( "correct" ); else puts( "incorrect" ); b. answer == 7 ? puts( "correct" ) : puts( "incorrect" ); c. puts( answer == 7 ? "correct" : "incorrect" ); d. printf( "%s\n", answer == 7 ? "correct" : "incorrect" );

puts( answer == 7 ? "correct" : "incorrect" );