Q: Which of the following Python statements correctly implements a dual alternative decision structure?

$$\text{if condition:}$$\newline\quad \text{statements}\newline\text{else:}\newline\quad \text{other statements}$

Q: Which logical operator would you use to check if a value $$x is $$between 10 and 20, inclusive?

$$x \u003e= 10 \text{ and } x \u003c= 20$$

Q: Which of the following is the correct syntax for a Python if-elif-else statement?

$$\text{if condition1:}\newline\quad \text{statements}\newline\text{elif condition2:}\newline\quad \text{statements}\newline\text{else:}\newline\quad \text{statements}$$

Question 1

Which of the following best describes a decision structure in programming?

Accepted Answer

A logical design that controls the order in which a set of statements execute, allowing for conditional execution.

Question 2

Given the following code, what will be the value of x after execution if y = 20?

$$	ext{if } y == 20:
ewline\quad x = 0$$

Accepted Answer

$$x = 0$$

Question 3

Which relational operator would you use to check if variable $$a is $$not equal to variable $$b$$?

Accepted Answer

$$a 
eq b$$

Question 4

What is the output of the following code?

$$s1 = 'New York'$$
$$s2 = 'Boston'
if s1$$ \u003e s2:
ewline\quad print(s2)
ewline\quad print(s1)
ewline$$else:
ewline\quad print(s1)
ewline\quad print(s2)$$

Accepted Answer

Boston
New York

Question 5

Which of the following Python statements correctly implements a dual alternative decision structure?

Accepted Answer

$$	ext{if condition:}$$
ewline\quad 	ext{statements}
ewline	ext{else:}
ewline\quad 	ext{other statements}$

Question 6

A payroll program must pay employees 1.5 times their regular hourly rate for all hours worked over 40 in a week. If an employee worked 45 hours at $20/hour, what is their gross pay?

Accepted Answer

$$950$$ (\$$800$$ regular + \$$150$$ overtime)

Question 7

Which logical operator would you use to check if a value $$x is $$between 10 and 20, inclusive?

Accepted Answer

$$x \u003e= 10 	ext{ and } x \u003c= 20$$

Question 8

What is the main difference between a while loop and a for loop in Python?

Accepted Answer

A while loop is used for condition-controlled repetition, while a for loop is used for count-controlled repetition.

Question 9

What will the following code display?

$$count = 10$$
$$while count \u003c 1:
ewline\quad print('Hello World')$$

Accepted Answer

Nothing will be printed

Question 10

Which of the following best describes a sentinel value in a loop?

Accepted Answer

A special value that marks the end of a sequence of items.

Question 11

What is the result of the following Boolean expression if $$a = 2$$, $$b = 4$$, and $$c = 6$$?

$$a == 4 	ext{ or } b \u003e 2$$

Accepted Answer

True

Question 12

Which of the following statements about string comparison in Python is TRUE?

Accepted Answer

Strings are compared based on their ASCII values, character by character.

Question 13

What is the main purpose of an input validation loop?

Accepted Answer

To repeatedly prompt the user until valid input is entered.

Question 14

Which of the following is the correct syntax for a Python if-elif-else statement?

Accepted Answer

$$	ext{if condition1:}
ewline\quad 	ext{statements}
ewline	ext{elif condition2:}
ewline\quad 	ext{statements}
ewline	ext{else:}
ewline\quad 	ext{statements}$$

Question 15

What will the following code display?

$$for number 	ext{ in } range(0, 501, 100):
ewline\quad print(number)$$

Accepted Answer

0 100 200 300 400 500

Question 16

Which of the following best describes the concept of 'garbage in, garbage out' (GIGO) in programming?

Accepted Answer

If a program receives invalid input, it will produce invalid output.

Question 17

What is the value of the variable 'total' after executing the following code?

total = 0
for count in range(1, 6):
    total = total + count
print(total)

Accepted Answer

15

Question 18

Which augmented assignment operator would you use to subtract 2 from variable $$y$$?

Accepted Answer

$$y -= 2$$

Question 19

In a nested loop, if the outer loop iterates 3 times and the inner loop iterates 4 times, how many total iterations will the inner loop execute?

Accepted Answer

12

Decision and Repetition Structures in Programming

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드