M2.2: SAQ 2.2

In short-circuit evaluation, Python stops evaluating a Boolean expression as soon as it knows the answer.

• True

• False

The logical operators and, or, and not each take two operands.

• True

• False

Which of the following is the "not equal to" operator in Python?

•  

  <>

•  

  !=

•  

  >=

•  

  <=

Statements that evaluate to either True or False are called __________ .

•  

  Boolean expressions

•  

  logical expressions

•  

  relational expressions

•  

  Any of the above

Which statement evaluates to True?

•  

  5 != 5 or 9 < 6

•  

  6 < 15 and 6 < 7

•  

  9 < 10 and 10 < 10

•  

  not 9 < 10

When calculating pi using the Wallis formula, the accumulator variable:

•  

  is increased by two each iteration.

•  

  must be initialized to zero.

•  

  must be initialized to one.

•  

  is multiplied by two each iteration.

What is wrong with this accumulator pattern, that is supposed to calculate the sum of all the multiples of seven between 1 and 100?

acc = 0

for x in range(0, 100, 7):

  acc = acc + x

•  

  The accumulator pattern is not used for multiplication

•  

  The accumulator variable is improperly initialized

•  

  The range function call does not produce the right terms

•  

  Nothing is wrong!

What is wrong with this accumulator pattern, that is supposed to calculate the product of all the multiples of seven between 1 and 100?

acc = 1

for x in range(0, 100, 7):

  acc = acc * x

•  

  The accumulator pattern is not used for multiplication

•  

  The accumulator variable is improperly initialized

•  

  The range function call does not produce the right terms

•  

  Nothing is wrong!

What is wrong with this accumulator pattern, that is supposed to calculate the product of all the odd numbers between 1 and 100?

acc = 0

for x in range(1, 100, 2):

  acc = acc * x

•  

  The accumulator pattern is not used for multiplication

•  

  The accumulator variable is improperly initialized

•  

  The range function call does not produce the right terms

•  

  Nothing is wrong!

Compound Boolean expressions are formed by using __________ .

• relational operators

• Boolean operators

• mathematical operators

• logical operators