SWE++ Review

Which of the following is NOT a valid variable name?

• cookies_left = 0

• cookiesLeft = 0

• cookies left = 0

• COOKIESLEFT = 0

Match the variables to their correct data types!

• integer

• x = 5

• Boolean

• y = 5.87

• float

• name = "Sarah"

• string

• result = True

x = 5.5

y = 1.0

Result of x += (2 * y) is:

• 7.5

• 2.0

• 6.5

• None of these

age = 11

What will happen if we write:

print("I am " + age + " years old!")

• The code will output: I am 11 years old!

• There will be an error because we forgot to convert the age variable to a string

• There will be an error because you can't print variables

• The code will output:

  Iam11yearsold!

What will happen if we write:

number = input("Enter a number: ")

result = number - 2

print(result)

• We will print out the result of number - 2

• Nothing will happen

• There will be an error because we forgot to convert number to an integer or a float

• There will be an error because we can't print variables

Match the following

• We know how many times to run code

• While loops are controlled by:

• for i in range():

• While loops are used when:

• a variable

• For loops are used when:

• We don't know how many times to run code

• While loops are written like:

• while some_condition == True:

• For loops are written like:

What will be the output of:

for i in range(3):

print(i)

• 0

  1

  2

• 1

  2

  3

• 0

  1

  2

  3

• 0

  0

  0

What will be the output of:

counter = 0

while counter < 3:

print(counter)

• 0

  1

  2

• This code generates an infinite loop!

• 0

  1

  2

  3

• 3

  2

  1

What will be the output of:

money_left = 6.00

while money_left > 0:

print("I bought a candy bar.")

money -= 2.00

• Nothing will output

• This code generates an infinite loop!

• I bought a candy bar.

  I bought a candy bar.

  I bought a candy bar.

• I bought a candy bar.

  money = 4.00

  I bought a candy bar.

  money = 2.00

  I bought a candy bar.

  money = 0.00

What it is the output of:

for i in range(10, 5, -1):

print(i)

• 10

  9

  8

  7

  6

• 5

  6

  7

  8

  9

• This code generates an error because for loops do not accept negative values!

• 10

  9

  8

  7

  6

  5