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Questions and Answers
What is the output of the following code if the user inputs x = 5 and y = 5? if x > y: print('x is greater than y') elif x < y: print('x is smaller than y') else: print('x is equal to y')
What is the output of the following code if the user inputs x = 5 and y = 5? if x > y: print('x is greater than y') elif x < y: print('x is smaller than y') else: print('x is equal to y')
- No output
- x is equal to y (correct)
- x is smaller than y
- x is greater than y
Which of the following correctly demonstrates the use of the logical operator 'or' in a conditional statement?
Which of the following correctly demonstrates the use of the logical operator 'or' in a conditional statement?
- if x < 10 and y < 10: print('Both less than 10')
- if z > x or z < y: print('z is either greater than x or less than y') (correct)
- if x == 10 or y == 10: print('At least one is ten')
- if not(x > 10): print('x is not greater than 10')
In an elif statement, which condition is evaluated if the preceding if condition evaluates to true?
In an elif statement, which condition is evaluated if the preceding if condition evaluates to true?
- All conditions following the `if` are skipped. (correct)
- The `else` condition is evaluated.
- It evaluates the next `elif` condition.
- The next `elif` condition is guaranteed to be true.
Which message would be displayed if a student enters a grade of 75 in the following conditional structure? if mark >= 80: print('Well Done!Distinction') elif mark > 60: print('You did good..') elif mark >= 50: print('You’ve passed..') else: print('You failed :(')
Which message would be displayed if a student enters a grade of 75 in the following conditional structure? if mark >= 80: print('Well Done!Distinction') elif mark > 60: print('You did good..') elif mark >= 50: print('You’ve passed..') else: print('You failed :(')
What is a potential issue with the following code snippet if the user inputs a value of 105? mark = int(input('Enter a grade:')) if mark >= 80: print('Well Done!Distinction') elif mark > 60: print('You did good…') elif mark >= 50: print('You’ve passed..') else: print('You failed :(')
What is a potential issue with the following code snippet if the user inputs a value of 105? mark = int(input('Enter a grade:')) if mark >= 80: print('Well Done!Distinction') elif mark > 60: print('You did good…') elif mark >= 50: print('You’ve passed..') else: print('You failed :(')
What is the primary function of the if statement in programming?
What is the primary function of the if statement in programming?
Which of the following represents a correct use of a boolean expression in an if statement?
Which of the following represents a correct use of a boolean expression in an if statement?
When should the elif keyword be used in conjunction with if statements?
When should the elif keyword be used in conjunction with if statements?
What does the else keyword do in an if-elif-else statement?
What does the else keyword do in an if-elif-else statement?
Which is an example of conditional logic that uses both if and not operators?
Which is an example of conditional logic that uses both if and not operators?
How does the not operator affect the evaluation of a boolean expression?
How does the not operator affect the evaluation of a boolean expression?
Given the line 'print(y > x or y > 20)', what would be the outcome if y = 15 and x = 10?
Given the line 'print(y > x or y > 20)', what would be the outcome if y = 15 and x = 10?
What will the following code snippet print? 'x, y = 10, 15; print(not x > 15)'
What will the following code snippet print? 'x, y = 10, 15; print(not x > 15)'
What is the primary purpose of an if statement in Python?
What is the primary purpose of an if statement in Python?
Which of the following describes a Boolean expression?
Which of the following describes a Boolean expression?
In a chained conditional statement, what is the purpose of the elif keyword?
In a chained conditional statement, what is the purpose of the elif keyword?
If the input to the following code is 25, what will the output be?
if x > 40:
print('Above 40')
else:
print('40 or below')
If the input to the following code is 25, what will the output be?
if x > 40:
print('Above 40')
else:
print('40 or below')
What keyword is used to catch all other cases not captured by an if or elif statement?
What keyword is used to catch all other cases not captured by an if or elif statement?
In the following code, what will be printed if the inputs are x = 5 and y = 10?
if x > y:
print('x is greater than y')
else:
print('x is not greater than y')
In the following code, what will be printed if the inputs are x = 5 and y = 10?
if x > y:
print('x is greater than y')
else:
print('x is not greater than y')
Which statement correctly represents usage of an else clause after an if statement?
Which statement correctly represents usage of an else clause after an if statement?
What does the following code output if the user enters a number 6?
x = int(input('Enter a number:'))
if (x % 2) == 0:
print('This number is even!')
print('Done.')
What does the following code output if the user enters a number 6?
x = int(input('Enter a number:'))
if (x % 2) == 0:
print('This number is even!')
print('Done.')
Flashcards
Comparison Operators
Comparison Operators
Operators used to compare values, returning True or False.
Logical Operators
Logical Operators
Operators that combine or modify boolean expressions (True/False).
Boolean Expressions
Boolean Expressions
Expressions that evaluate to either True or False.
Conditional Logic
Conditional Logic
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If Statement
If Statement
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True
True
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False
False
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Conditional Execution
Conditional Execution
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Multiple Conditions
Multiple Conditions
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Short if
Short if
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What if the user's grade is greater than 100?
What if the user's grade is greater than 100?
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Study Notes
Branching - Week 4, Lecture 1
- Topics covered in the lecture include Recap, Recap Questions, Recap Questions - cont'd, Learning Outcomes, Introduction, Outline, Comparison Operators, A closer look at comparison operators, Recap on logical operators, A closer look at logical operators, A closer look at logical operators, The need for branching, The If Statement, Writing an if statement in Python, Example 1, Exercise, Example 2, else, Another else example, elif, elif example, Summary of if-elif-else, Multiple conditions, Multiple conditions - continued, Exercise, Exercise - solution, Short if, Short if else, Problem, Nested if else, Consequences.
- Review of logical operators (
and,or,not), and comparison operators (==,!=,<,>,<=,>=) is essential for conditional statements. - The
if,elif, andelsestatements are fundamental for conditional execution. - Python allows
ifstatements to be written concisely when there are noeliforelseclauses. elifstatements allow the execution of different blocks of code based on multiple conditions.- Nesting
ifstatements within each other allows for more complex conditional logic. - The Python
input()function converts user input to a string, which needs to be cast to the appropriate data type if needed (e.g.,intif integer input is expected). - Handling floating-point arithmetic has specific considerations because of potential rounding errors. Using a small margin to avoid these errors is crucial for accurate comparison.
- An example to demonstrate branching logic, involving determining whether a grade is passing or failing is included.
- A possible exercise of writing a program to check if a number is even is provided.
- Several examples illustrate the practical application of these conditional statements.
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Description
This quiz covers the fundamental concepts of branching in Python, including the use of comparison and logical operators. You'll explore the structure and syntax of if, elif, and else statements, alongside exercises to reinforce your understanding. Test your knowledge on how to implement conditional statements effectively.
