Elementary Programming

Question 1

If you enter 1 2 3 in one line, when you run this program, what will happen?

print(“Enter three numbers: “)
number1 = int(input())
number2 = int(input())
number3 = int(input())

 # Compute average
 average = (number1 + number2 + number3) / 3

 # Display result
 print(average)

A. The program runs correctly and displays 1.0
B. The program runs correctly and displays 2.0
C. The program runs correctly and displays 3.0
D. The program runs correctly and displays 4.0
E. The program will have a runtime error on the input.

Answer 1

E. The program will have a runtime error on the input.

Hint: You have to enter each number on a separate line.

Question 2

number1, number2, and number3, average, input, float, and print are the names of things that appear in the program. In programming terminology, such names are called _______.

Answer 2

identifiers.

Question 3

Which of the following identifiers are valid? Which are Python keywords?
miles, Test, a+b, b-a, 4#R, $4, #44, apps
if, elif, x, y, radius

Answer 3

Valid identifiers: miles, Test, apps, x, y, radius
Invalid identifiers: a+b, b-a, 4#R, $4, #44, if, elif
Keywords: if, elif

Question 4

What will be displayed by the following code?

x = 1
x = x + 2.5
print(x)

 A. 1
 B. 2
 C. 3
 D. 3.5
 E. The statements are illegal

Answer 4

D. 3.5

Question 5

What is wrong in the following statement?

2 = a

Answer 5

You should write a = 2

Question 6

What is the result of 25 / 4? How would you rewrite the expression if you wished the result to be an integer number?

Answer 6

25 / 4 is 6.25. If you want the result to be an integer, use 25 // 4, which evaluates to 6.

Question 7

What is the result of 45 / 4?
 A. 10
 B. 11
 C. 11.25
 D. 12

Answer 7

C. 11.25

Question 8

2 ** 3 evaluates to \_\_\_\_\_\_\_\_\_\_.
 A. 9
 B. 8
 C. 9.0
 D. 8.0

Answer 8

B. 8

Question 9

What is the result of 45 // 4?
 A. 10
 B. 11
 C. 11.25
 D. 12

Answer 9

B. 11

Question 10

Which of the following expressions will yield 0.5?
 A. 1 / 2
 B. 1.0 / 2
 C. 1 // 2
 D. 1.0 // 2
 E. 1 / 2.0

Answer 10

Which of the following expressions will yield 0.5?
A. 1 / 2
B. 1.0 / 2
E. 1 / 2.0

Question 11

2 * 3 ** 2 evaluates to \_\_\_\_\_\_\_\_\_\_.
 A. 36
 B. 18
 C. 12
 D. 81

Answer 11

B. 18

Hint: The ** operator is performed before the * operator.

Question 12

In the expression 45 / 4, the values on the left and right of the / symbol are called \_\_\_\_.
 A. operators
 B. operands
 C. parameters
 D. arguments

Answer 12

B. operands

Question 13

The % operator, known as ______ or ______ operator, yields the _______ after _______.

Answer 13

The % operator, known as remainder or modulo operator, yields the remainder after division.

Question 14

If today is Tuesday, what day of the week will it be in 100 days?

Answer 14

(2 + 100) % 7 = 4. So it is Thursday

Question 15

Which of the following expression results in a value 1?
 A. 2 % 1
 B. 15 % 4
 C. 25 % 5
 D. 37 % 6

Answer 15

D. 37 % 6

Question 16

25 % 1 is \_\_\_\_\_
 A. 1
 B. 2
 C. 3
 D. 4
 E. 0

Answer 16

E. 0

Question 17

24 % 5 is \_\_\_\_\_
 A. 1
 B. 2
 C. 3
 D. 4
 E. 0

Answer 17

D. 4

Question 18

42 / 5
42 // 5
42 % 5
40 % 5
1 % 2
2 % 1
45 + 4 * 4 - 2
45 + 43 % 5 * (23 * 3 % 2)
5 ** 2
5.1 ** 2

Answer 18

42 / 5 = 8.4
42 // 5 = 8
42 % 5 = 2
40 % 5 = 0 
1 % 2 = 1
2 % 1 = 0
45 + 4 * 4 - 2 = 59
45 + 43 % 5 * (23 * 3 % 2) = 48
5 ** 2 = 25
5.1 ** 2 = 26.0099

Question 19

Which of the following is equivalent to 0.025?
 A. 0.25E-1
 B. 2.5e-2
 C. 0.0025E1
 D. 0.00025E2
 E. 0.0025E+1

Answer 19

All of these expressions are equivalent to 0.025.

Question 20

If a number is too large to be stored in memory, it _____________.

Answer 20

causes overflow

Question 21

What is the result of evaluating 2 + 2 ** 3 / 2?
 A. 4
 B. 6
 C. 4.0
 D. 6.0

Answer 21

D. 6.0

Hint: In Python 3, the result of the / operator is a float value.

Question 22

Assume that a = 1, and that each expression is independent. What are the results of the following expressions?
a += 4 
a -= 4 
a *= 4 
a /= 4 
a //= 4 
a %= 4 
a = 56 * a + 6

Answer 22

a += 4 (a is 5)
a -= 4 (a is -3)
a *= 4 (a is 4)
a /= 4 (a is 0.25)
a //= 4 (a is 0)
a %= 4 (a is 1)
a = 56 * a + 6 (a is 62)

Question 23

What is the value of i printed?

j = i = 1
i += j + j * 5
print("What is i?", i)
 A. 0
 B. 1
 C. 5
 D. 6
 E. 7

Answer 23

E. 7

Hint: i and j are 1, (1 + 1 * 5) add to i. i becomes 7.

Question 24

What is x after the following statements?

x = 2
y = 1
x //= y + 1
 A. x is 1.
 B. x is 2.
 C. x is 3.
 D. x is 4.

Answer 24

A. x is 1.

Hint: x is 2 and y is 1. x // (1 + 1) is 1. So, the answer is a.

Question 25

Which of the following statements are the same?

(A) x -= x + 4
(B) x = x + 4 - x
(C) x = x - (x + 4)

A. (A) and (B) are the same
B. (A) and (C) are the same
C. (B) and (C) are the same
D. (A), (B), and (C) are the same

Answer 25

B. (A) and (C) are the same

Question 26

What does time.time() return?

Answer 26

time.time() returns the seconds with millisecond precision since the UNIX epoch.

Question 27

How do you obtain the seconds from the returned value for time.time()?

Answer 27

To obtain seconds from the return value of time.time(), use int(time.time()).

Question 28

The time.time() returns ________________ .

Answer 28

the current time in milliseconds since midnight, January 1, 1970 GMT (the Unix time).

Question 29

Requirement Specification is

Answer 29

a formal process that seeks to understand the problem that the software will address and to document in detail what the software system needs to do.

Question 30

Analysis seeks to

Answer 30

analyze the data flow and to identify the system’s input and output.

Question 31

Design is to

Answer 31

design a process for obtaining the output from the input.

Question 32

Implementation involves

Answer 32

translating the system design into programs.

Question 33

Testing ensures that

Answer 33

the code meets the requirements specification and weeds out bugs.

Question 34

Deployment makes the______ available for use.

Answer 34

software

Question 35

Maintenance is concerned with ______ and _______ the product.

Answer 35

updating and improving

Question 36

The essence of system analysis and design is ____, _____, and ______. This is called _____.

Answer 36

The essence of system analysis and design is input, process, and output. This is called IPO.