Pick the piece of code which will print 42.

my_var1 = '4'
my_var2 = '2'
print(my_var1 + my_var2)

my_Var1 = 35
my_var2 = 7
print(my_var1 + my_Var2)

my var1 = 7
my var2 = 6
print(my var1 * my var2)

In mathematics, we define intervals, closed, open and semi-open. The semi-open interval \([3,7[\) includes all real numbers that are greater than or equal to 3 and strictly less than 7. Which of the following code fragments display true on the standard output if and only if x belongs to the interval \([a, b[\) ? We assume for this question that the value stored in the variable a is strictly less than the one stored in the b variable.

if x <= a and x < b:
    print('true')

if a <= x and x < b:
    print('true')

if a < x and x < b:
    print('true')

Which of the following code fragments prints 14?

to_print = '1'
print(to_print + 4)

print(43/3)

print(43//3)

Which of the following code fragments calculates the sum of the first n positive integers?

i = 1
sum = 0
while i <= n:
    sum = sum+i
    i+=1

    i = 1
    sum = 0
while i < n:
    sum = sum+i
    i+=1

i = 0
sum = 0
while i < n:
    sum = sum+i
    i+=1

i = n
sum = 0
while i <= n:
    sum = sum+i
    i-=1

Which of the following program fragments respects the syntax and semantics of the language?

>>> x = 4
>>> y = 'test'
>>> z = 8
>>>     print(x)

>>> x = 4
>>> x = 'test'
>>> z = 8
>>> print(x)
4

>>> x = 4
>>> y = 'test'
>>> z = 8
>>> print(x)
4

Check the snippets which contain a valid comment.

""" This is a comment """
for i in range(0,5):
    print(i)

for i in range(0,5):
    print(i) # This is a comment

for i in range(0,5):
    print("#This is a comment")

It is often useful to be able to swap values between variables. Consider the following variables:

a = 42
b = 41

Which of following code fragments swap the values correctly?

a,b = b,a

b = a
a = b

c = b
b = a
a = c

Consider a program that manipulates two variables: a and b . Among the code fragments below, which one correctly stores in the variable min the minimum of the contents of the variables a and b ?

if a > b:
min = a
else:
min = b

if a > b:
    min = b
else:
    min = a

if a > b:
    min = a
else:
    min = b

Which of these code fragments places in the variable abs the absolute value of x ?

if x > 0:
    abs = -x
else:
    abs = x

if x < 0:
    abs = -x
else:
    abs = x

if x == 0:
    abs = x
else:
    abs = -x