Deck 3: Loops and Selection Statements

Question 1

The not operator has a lower precedence than the and and or operators.

Answer 1

False

Question 2

The comparison operators are applied after addition but before assignment.

Answer 2

True

Question 3

Conditional iteration requires that a condition be tested within the loop to determine whether the loop should continue.

Answer 3

True

Question 4

"A"

Question 5

The augmented assignment operations have a higher precedence than the standard assignment operation.

Question 6

When the step argument is a negative number, the range function generates a sequence of numbers from the first argument down to the second argument plus 1.

Question 7

A condition expresses a hypothesis about the state of its world at that point in time.

Question 8

There are two types of loops-those that repeat an action a predefined number of times (definite iteration) and those that perform the action until the program determines that it needs to stop (indefinite iteration).

Question 9

For the most part, off-by-one errors result when the programmer incorrectly specifies the lower bound of the loop.

Question 10

The or operator returns True if and only if both of its operands are true, and returns False otherwise.

Question 11

Loop statements allow a computer to make choices.

Question 12

Simple Boolean expressions consist of the Boolean values True or False, variables bound to those values, function calls that return Boolean values, or comparisons.

Question 13

The assignment symbol can be combined with the arithmetic and concatenation operators to provide augmented assignment operations.

Question 14

The statements in the loop body need not be indented and aligned in the same column.

Question 15

4 != 4 evaluates to True.

Question 16

The if-else statement is the most common type of selection statement.

Question 17

The not operator expects a single operand and returns its logical negation, True, if it's false, and False if it's true.

Question 18

The simplest form of selection is the if-else statement.

Question 19

The Boolean data type is named for the twentieth-century British mathematician George Boole.

Question 20

In Python, = means equals, whereas == means assignment.

Question 21

Some computer scientists argue that a while True loop with a delayed exit violates the spirit of the while loop.

Question 22

Given the following statement: "%4d" % var1, which of the following is accurate?

A) The variable var1 must be an integer value.
B) The variable var1 must be a string value.
C) The variable var1 will be in octal format.
D) The variable var1 will be formatted regardless of type.

Question 23

In evaluating a loop, you find the following statement: "value += 1". What happens to the value variable upon each iteration of the loop?

A) The variable is reset to an int type, with a value of 1.
B) The variable's value is changed to a positive value.
C) The variable is increased by 1 each iteration through the loop.
D) The variable is incremented by itself.

Question 24

What statement should you use to print the value of total with a precision of 5 digits?

A) print("The total is %5." % total)
B) print("The total is %0.5d" % total)
C) print("The total is %f" % float(total, 5))
D) print("The total is %0.5f" % total)

Question 25

Although the while loop can be complicated to write correctly, it is possible to simplify its structure and thus improve its readability.

Question 26

What are the two different types of loops that are used within the Python language? (Choose two.)

A) predetermined looping
B) definite iteration
C) infinite cycling
D) indefinite iteration

Question 27

What comparison operator is used to test whether an expression does NOT equal another expression?

A) -=
B) !=
C) /=
D) _=

Question 28

What is the minimum number of spaces that should be used to create an indented statement?

A) one space
B) two spaces
C) three spaces
D) four spaces

Question 29

In a conditional iteration loop, such as a while loop, what is a sentinel value?

A) A sentinel value is a user-provided input value that proceeds to the next loop.
B) A sentinel value is a user-provided input value that changes the structure of the loop.
C) A sentinel value is a special value provided by the user to terminate the loop.
D) A sentinel value is a special value provided by the user to restart the loop.

Question 30

If A is True, what will the statement "not A" return?

A) Undefined
B) True
C) False
D) BooleanError

Question 31

What is a one-way selection statement in the context of Python?

A) It is a single if statement without a corresponding else statement used to test a condition and run statements, then proceed to the next statement.
B) It is a single if-else statement block that is used to test a condition and run statements, as well as provide a default path for execution.
C) It is a switch statement block that is used to direct the flow of data based on a single condition.
D) It is an if statement that tests no conditions, but provides a block for execution.

Question 32

You are running a Python script and suspect that the script has entered an infinite loop. What key combination can you use to halt the loop?

A) CTRL + Esc
B) CTRL + c
C) Alt + b
D) CTRL + Break

Question 33

What character is used as the format operator when formatting output?

A) ^
B) $
C) %
D) @

Question 34

When using the range function, what effect does the specification of a third argument have?

A) The third argument is used as the starting point for the range function.
B) The third argument specifies a step value to be used in the range.
C) The third argument declares an exponential value the numbers will be raised to.
D) The third argument is simply included in the sequence, assuming it wasn't already in the range.

Question 35

The while loop is also called a sentinel-control loop, because its condition is tested at the top of the loop.

Question 36

Inside of a loop, after a termination condition has been met, what statement can be used to cause an exit from the loop and execute the remainder of the script?

A) exit
B) break
C) quit
D) halt

Question 37

The while loop is also known as what kind of a loop?

A) infinite loop
B) operational loop
C) user-control loop
D) entry-control loop

Question 38

A while loop can be used for a count-controlled loop.

Question 39

An off-by-one error is an example of what type of error in programming?

A) logic error
B) syntax error
C) type error
D) input error

Question 40

The statements within a while loop can execute one or more times.

Question 41

What scenario would it make logical sense to use a multi-way selection statement for?

A) You need to convert numeric grades to letter grades.
B) You need to test if the value of A is larger than B.
C) You need to determine if a number is positive or negative.
D) You need to test if a variable is True or False.

Question 42

Assuming that the value of x is 4, and the value of y is 6, what is the value of the following expression? (x - y)**2 > y

A) True
B) False
C) Undefined
D) TypeError

Question 43

The use of +=, -=, and *= are all examples of what type of operators?

A) protracted assignment operators
B) augmented assignment operators
C) extended arithmetic operators
D) overloaded mathematic operators

Question 44

What is NOT a Boolean or logical operator used in the Python language?

A) and
B) or
C) not
D) xor

Question 45

In programming, what is a prototype?

A) It is a rough draft of a program.
B) It is a program in final stages of development.
C) It is a program statement that builds a module.
D) It is a production-ready program.

Question 46

In general terms, what does a selection statement do?

A) It forces a computer to favor one value over another.
B) It allows a computer to make choices based on test conditions.
C) It allows a computer to select the values that are most economical.
D) It allows a computer to selectively execute based on processing cost.

Question 47

What function call will generate a random number in the range of 1 through 6 using the random module?

A) random.randnum(1, 6)
B) random.randint(range(1-6))
C) random.randint(1, 6)
D) random.random(1, 6)

Question 48

What statement regarding precedence of operators is accurate?

A) The assignment operator (=) is higher in precedence than exponentiation (**).
B) The logical conjunction (and) is higher in precedence than the logical negation (not).
C) The comparison operators (==, !=, , =) are higher in precedence than the assignment operator (=).
D) The addition and subtraction operators (+, -) are lower in precedence than the logical conjunction operator (and).

Question 49

What part of the loop comprises the statements to be executed?

A) The loop header.
B) The loop body.
C) The loop end.
D) The loop tail.

Question 50

What is a count controlled loop?

A) It is a loop that counts iterations until a sentinel value is received.
B) It is a loop that continues based on a certain time interval.
C) It is a loop that prints out a count of values for the user.
D) It is a loop that counts through a range of numbers to control when the loop ends.