CS Exam 1 - Chapter 2
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
