CS Exam 1 - Chapter 2

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Which of the following functions cause an error? A. int("034") B. eval("034") C. int("3.4") D. eval("3.4")

BC

To add a value 1 to variable x, you write A. 1 + x = x B. x += 1 C. x := 1 D. x = x + 1 E. x = 1 + x

BDE

Which of the following functions return 4. A. int(3.4) B. int(3.9) C. round(3.4) D. round(3.9)

D

To add number to sum, you write (Note: Python is case-sensitive) A. number += sum B. number = sum + number C. sum = Number + sum D. sum += number E. sum = sum + number

DE

Which of the following statements are the same? (A) x -= x + 4 (B) x = x + 4 - x (C) x = x - (x + 4)

(A) and (C) are the same

25 % 1 is _____

0

Suppose x is 1. What is x after x -= 1?

0

Which of the following expressions will yield 0.5? 1 / 2 1.0 / 2 1 // 2 1.0 // 2 1 / 2.0

1 / 2 1.0 / 2 1 / 2.0

To following code reads two number. Which of the following is the correct input for the code? x, y = eval(input("Enter two numbers: "))

1, 2

What is the result of 45 // 4?

11

What is the result of 45 / 4?

11.25

2 * 3 ** 2 evaluates to __________.

18

What is x after the following statements? x = 1 x *= x + 1

2

What will be displayed by the following code? x, y = 1, 2 x, y = y, x print(x, y)

2 1

If you enter 1 2 3 in three separate lines, when you run this program, what will be displayed? print("Enter three numbers: ") number1 = eval(input()) number2 = eval(input()) number3 = eval(input()) # Compute average average = (number1 + number2 + number3) / 3 # Display result print(average)

2.0

If you enter 1, 2, 3, in one line, when you run this program, what will be displayed? number1, number2, number3 = eval(input("Enter three numbers: ")) # Compute average average = (number1 + number2 + number3) / 3 # Display result print(average)

2.0

Suppose x is 1. What is x after x += 2?

3

What is x after the following statements? x = 1 y = 2 x *= y + 1

3

What will be displayed by the following code? x = 1 x = 2 * x + 1 print(x)

3

What will be displayed by the following code? x = 1 x = x + 2.5 print(x)

3.5

Which of the following expression results in a value 1? 2 % 1 15 % 4 25 % 5 37 % 6

37 % 6

24 % 5 is _____

4

What is x after the following statements? x = 2 y = 1 x *= y + 1

4

What is the result of evaluating 2 + 2 ** 3 / 2?

6.0

What is the result of eval("1 + 3 * 2")?

7

What is the value of i printed? j = i = 1 i += j + j * 5 print("What is i?", i)

7

2 ** 3 evaluates to __________.

8

2 ** 3.0 evaluates to __________.

8.0

What function do you use to read a string?

input("Enter a string")

Which of the following is a valid identifier? $343 mile 9X 8+9 max_radius

mile max_radius

Which of the following is a valid identifier? import mile1 MILE (red) "red"

mile1 MILE

In the expression 45 / 4, the values on the left and right of the / symbol are called ____.

operands

The time.time() returns ________________ .

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

An identifier can contain digits, but cannot start with a digit True or False

true

An identifier cannot be a keyword True or False

true

What is y displayed in the following code? x = 1 y = x = x + 1 print("y is", y)

y is 2 because x + 1 is assigned to x and then x is assigned to y.

_______ is the code in natural language mixed with some program code.

Pseudocode

If you enter 1 2 3 in one line, when you run this program, what will happen? print("Enter three numbers: ") number1 = eval(input()) number2 = eval(input()) number3 = eval(input()) # Compute average average = (number1 + number2 + number3) / 3 # Display result print(average)

The program will have a runtime error on the input.

You can place the line continuation symbol __ at the end of a line to tell the interpreter that the statement is continued on the next line.

\

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

all of the above!

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

causes overflow


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