Deck 10: Debugging

Question 1

A runtime error occurs because of a mistake made in the formulation of the logic used to accomplish a particular task.

Answer 1

False

Question 2

Adding the retry statement to an exception handler can generate an endless loop, creating an entirely new problem.

Answer 2

True

Question 3

The best way to avoid logical errors is to carefully plan out the design of your programs before writing them.

Answer 3

True

Question 4

Syntax errors occur when a program attempts to perform an illegal action.

Question 5

Runtime errors can sometimes be buried deep inside seldom-used methods and may not make their presence known until a particular set of circumstances occur.

Question 6

Logical errors are program errors that occur if you do not correctly follow Ruby's syntactical rules when writing your program statements

Question 7

Unfortunately, syntax errors can also occur for a variety of reasons that are outside your control.

Question 8

To define an error handler, you need to first identify a statement within your Ruby program where you think an error may be able to occur, then precede it with the start keyword.

Question 9

If you write a statement that is supposed to multiply two numbers but you accidentally divided one number by the other, a runtime error would occur.

Question 10

When an error occurs in a Ruby program, an exception object is generated and information about the error is assigned to it.

Question 11

Generally, all you need in order to track down and fix a syntax error is the information provided by Ruby's error messages.

Question 12

Using the operator, you can access information about an exception.

Question 13

If your program recovers from an exception, you can use the retry statement to repeat the execution of an entire begin / end code block.

Question 14

Whenever an exception is raised, Ruby looks for an exception handler capable of handling it.

Question 15

When an exception is generated, it is said to be lowered.

Question 16

If it finds a handler capable of handling an exception, control is transferred to the handler. Otherwise, an error message is displayed and the program terminates.

Question 17

Ruby checks programs for syntax errors before executing them.

Question 18

The Kernel class's system method runs an external command or application as a separate process.

Question 19

Programming errors, sometimes referred to as bugs, are unique to Ruby programming.

Question 20

When an exception occurs, the interpreter displays an error message and forces the immediate termination of the program.

Question 21

____ errors are ones that occur if you do not correctly follow Ruby's syntactical rules when writing your program statements.

A) Syntax
B) Logical
C) Runtime
D) Overload

Question 22

Whenever an exception occurs, Ruby looks for an ____ capable of handling it.

A) error trap
B) exception trap
C) exception handler
D) error handler

Question 23

Ruby's debugger provides you with a test environment for running and monitoring your programs.

Question 24

Using the Kernel class's ____ method, you can execute an external command or application as a separate process.

A) syscall
B) system
C) superclass
D) status

Question 25

When an error occurs in a Ruby program, a ____ object is generated.

A) error
B) exception
C) runtime
D) syntax

Question 26

When a(n) ____ occurs, the interpreter default behavior is to display an error message and force the immediate termination of the program.

A) syntax
B) error
C) exception
D) runtime

Question 27

What type of error will the following statement generate? puts 10 / 0

A) Syntax
B) Logical
C) Runtime
D) Overload

Question 28

____ errors occur when a program attempts to perform an illegal action.

A) Syntax
B) Logical
C) Runtime
D) Overload

Question 29

Which of the following is a type of error that Ruby programs are subject to?

A) Logical
B) Runtime
C) Syntax
D) All of the above

Question 30

To define an error handler, you need to first identify a statement within your Ruby program where you think an error may be able to occur, then precede it with the ____ keyword.

A) rescue
B) retry
C) begin
D) end

Question 31

The debugger is loaded by starting the Ruby interpreter with the -debug run option.

Question 32

____ errors can sometimes be buried deep inside seldom-used methods and may not make their presence known until a particular set of circumstances occur.

A) Syntax
B) External
C) Runtime
D) Overload

Question 33

Ruby allows you to programmatically deal with an error by ___ exceptions.

A) handling
B) ignoring
C) bypassing
D) None of the above

Question 34

Ruby's built-in debugger allows you to monitor and control the execution of your programs on a statement-by-statement basis, pausing to check on the value of variables when necessary.

Question 35

If an exception occurs and a exception handler cannot be found to handle it, what happens?

A) An error message is displayed and the program terminates
B) An error message is displayed and the program continues its execution
C) An error message is displayed, prompted the user to continue or terminate the program
D) Program executes stops and no error is generated.

Question 36

A simple way of determining what is happening in a Ruby program is to strategically embedding print or puts statements throughout the program.

Question 37

When an exception is generated, it is said to be ____.

A) lowered
B) accelerated
C) trapped
D) raised

Question 38

Ruby checks programs for ____ errors before executing them.

A) Syntax
B) Logical
C) Runtime
D) Overload

Question 39

A(n) ____ error occurs because of a mistake made in the formulation of the logic used to accomplish a particular task.

A) Syntax
B) Logical
C) Runtime
D) Overload

Question 40

You can type the word break to generate a list of all currently set breakpoints and to see the line number associated with each breakpoint.

Question 41

To monitor and debug larger Ruby programs, you need to work with Ruby's built-in ____.

A) compiler
B) debugger
C) interpreter
D) analyzer

Question 42

If your program recovers from an exception, you can use the ____ statement to repeat the execution of an entire begin / end code block

A) retry
B) rescue
C) end
D) begin

Question 43

When debugging a Ruby program, you can use the ____ method to examine the value assigned to the program's local variables.

A) var local
B) var variable
C) show local
D) show variable

Question 44

When debugging a Ruby program, you can use the ____ method to execute the next statement in the program and then halt program execution.

A) skip
B) run
C) step
D) continue

Question 45

A ____ is a marker placed in a program that pauses program execution when it is reached.

A) marker
B) pointer
C) link
D) breakpoint

Question 46

Using the ____ operator, you can access information about an exception.

A) >
B) =>
C) >=
D) !>

Question 47

When debugging a Ruby program, you can use the ____ method to execute the program without any stepping, stopping execution when a breakpoint is reached or the programs ends.

A) run
B) cont
C) execute
D) continue

Question 48

Adding the ____ statement to an exception handler can generate an endless loop

A) end
B) rescue
C) retry
D) begin

Question 49

To start the Ruby debugger, you execute which of the following commands?

A) ruby -i debug
B) ruby -e debug
C) ruby -x debug
D) ruby -r debug

Question 50

Exceptions that occur within Ruby programs are treated as objects from the ____ class and its family of subclasses.

A) Kernel
B) Error
C) Numeric
D) Exception