Unit 3 5-7 | Boolean Expressions
- Lesson Overview: 3.5 - Boolean Expressions
- Lesson Overview: 3.6 - Conditionals
- Analyzing Code Walkthrough
Lesson Overview: 3.5 - Boolean Expressions
- Here we will focus on:
- basics of Booleans
- its relationship with binary
- relational operators
- Logical Operators
What is a boolean?
- A data type with two possible values: true or false
Boolean and Binary
So similar yet so different.
- Boolean math and binary notation both use the same two ciphers: 1 and 0.
- However, please note that Boolean quantities are restricted to a singlular bit (can only be either 1, or 0)
- On the otherhand, binary numbers may be composed of many bits adding up in place-weighted form to any finite value, or size
Must Knows
- A Boolean value is either TRUE or FALSE
- The AP Exam will provide you with a reference sheet with the operators below.
- A few ways these operators could be used...
- With the grades below, use a boolean expression to determine if the average grade is above an 80 and print the result (True or False)
- Try it in as few steps as possible!
- Be creative! There are obviously TONS of different practical solutions
grade1 = 90
grade2 = 65
grade3 = 60
grade4 = 75
grade5 = 95
gradeAvg = (grade1+grade2+grade3+grade4+grade5)/5
print(gradeAvg > 80)
print("100 == 100:",100==100)
print("Hello == Adios:","greeting"=="farewell")
print("Hello != Adios:","greeting"!="farewell")
print("Hello == Hola:","greeting"=="greeting")
print("5>=4:", 5>=4)
print ('')
# Notice that relational operators can even work on lists!
# For lists, the relational operator compares each respective component until an answer is derived
print("['a','b','c'] > ['x','y','z']:", ['a','b','c'] > ['x','y','z'])
print("[1,2,3,5] > [1,2,3,4]:", [1,2,3,5] > [1,2,3,4])
print("[1,2,3,5] < [1,2,3,4]:", [1,2,3,5] < [1,2,3,4])
print("[1,2,3,5] == [1,2,3,4]:", [1,2,3,5] == [1,2,3,4])
Logical Operators!
These types of operators don't necessarily deal with equivalent/non-equivalent values, but they rather work on operands to produce a singular boolean result
- AND : returns TRUE if the operands around it are TRUE
- OR : returns TRUE if at least one operand is TRUE
- NOT : returns TRUE if the following boolean is FALSE
print("1 > 2 or 5 < 12:", 1 > 2 or 5 < 12)
# Output TRUE using OR ^
# Output FALSE using NOT
print("24 > 8:",24 > 8)
# Output FALSE using AND
print("10 > 20:", 10 > 20 and False)
x = 20
y = 10
if x > y:
print("x is greater than y")
x = 9
y = 10
if x > y:
print("x is greater than y")
else:
print("x is not greater than y")
num1 =103
num2 = 97
sum = num1 + num2
if sum == 200:
print(sum)
else:
print(sum)
- Nested conditional statements consist of conditional statements within other conditional statements
- Utilizes "if else" statements within "if else" statements
- Basics of a nested conditional:
-
Block Coding Visual of Nested Conditionals:
-
Example Psuedocode of Nested Conditional Statements
Analyzing Code Walkthrough
- Psuedocode to the left, block code to the right
-
Approach the problem by going through each condition one at a time
- Decide which ones are false to skip and which ones are true to execute
-
You Try:
score = 82
if (score >= 90)
{
console.log("You got an A, congrats!")
}
else
{
if (score >= 75)
{
console.log("Please come to retake up to a 90 next week at tutorial!")
}
else
{
console.log("You have detention!!")
}
}
protein = 25
carbs = 36
sugar = 11
if (carbs >= 55 || protein <= 20 || sugar >= 15)
{
console.log("Your lunch is too unhealthy, please pick a new one")
}
else
{
if (carbs < 35 || protein < 25)
{
console.log ("This lunch is alright but try to add some more carbs or protein")
}
else
{
if (sugar >= 11)
{
console.log ("Looks great but lets see if we can cut down on sugar, we don't want diabetes!")
}
else
{
console.log ("Amazing, you created a healthy lunch!!!")
}
}
}
Writing Nested Code Activity
- Write a program that fits these conditions using nested conditionals:
- If a person has at least 8 hours, they are experienced
- If a person is experienced their salary is 90k, if they have ten hours or above their salary 150k
- If a person is inexperienced their salary is always 50k
- print the salary of the person at the end and whether they are experienced or not
Hacks Assignments:
Conditionals:
- Write a program that fits these conditions using nested conditionals:
- If the product is expired, print "this product is no good"
- If the cost is above 50 dollars, and the product isn't expired, print "this product is too expensive"
- If the cost is 25 dollars but under 50, and the product isn't expired, print "this is a regular product"
- If the cost is under 25 dollars, print "this is a cheap product"
experience = 10
salary = 100000
if (experience> 10){
console.log("you are experienced")
}
else{
if (experience >=10){
console.log("Experienced, Salary is 150k.")
}
else{
console.log("Experienced salary is 90k")
}
}
//True = product is expired, false = product isn't expired
productStatus = false
cost = 700000
if (productStatus){
console.log("This product is no good")
}
else{
if(cost > 50 ){
console.log("this product is too expensive")
}
if(cost < 50 && cost> 25)
console.log("this is a regular product")
if (cost<25){
console.log("this is a cheap product")
}
}
import getpass, sys
def question_with_response(prompt):
print("Question: " + prompt)
msg = input(prompt)
return msg
questions = 3
correct = 0
print('Hello, ' + getpass.getuser())
print("You will be asked " + str(questions) + " questions.")
print("Are you ready for this World Cup Quiz? Let's start!")
rsp = question_with_response("Who won the 2010 World Cup?: A. Argentina B. Germany C. Spain D. Uruguay")
if rsp == "Spain" or rsp == "C":
print(rsp + " is correct!")
correct += 1
else:
print(rsp + " is incorrect!")
rsp = question_with_response("Who won the 2014 World Cup?: A. Germany B. Brazil C. Argentina D. Netherlands")
if rsp == "Germany" or rsp == "A":
print(rsp + " is correct!")
correct += 1
else:
print(rsp + " is incorrect!")
rsp = question_with_response("Who won the 2018 World Cup?: A. England B. Belgium C. Germany D. France")
if rsp == "France" or rsp == "D":
print(rsp + " is correct!")
correct += 1
else:
print(rsp + " is incorrect!")
print(getpass.getuser() + " you scored " + str(correct) +"/" + str(questions))
Boolean/Conditionals:
- Create a multiple choice quiz that ...
- uses Boolean expressions
- uses Logical operators
- uses Conditional statements
- prompts quiz-taker with multiple options (only one can be right)
- has at least 3 questions
- Points will be awarded for creativity, intricacy, and how well Boolean/Binary concepts have been intertwined