Unit Notes and Homework (Day 3)
Welcome to the World of Booleans and Conditionals!
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...
Relational Operators in action
- How could you use operators to determine if the average of 5 grades is greater than 80?
- 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
def Average(lst):
return sum(lst) / len(lst)
lst = [90, 65, 60, 75, 95]
average = Average(lst)
print("Average of the list =", round(average, 2))
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:", not 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 = 20
y = 10
if x > y:
print("x is greater than y")
else:
print("x is not greater than y")
num1 = 100
num2 = 400
sum = num1 + num2
if sum == 200:
print("yea 200")
else:
print(sum)
Lesson Overview - 3.7 Nested Conditionals
- 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
time = 3
score = 1000
lives = 5
if time < 3 and score > 1000:
lives = lives + 3
else:
if time < 3 or score > 1000:
lives = lives + 1
else:
lives = lives - 1
print(lives)
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!")
}
}
Output: Please come to retake up to a 90 next week at tutorial!
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!!!")
}
}
}
Output: Looks great but lets see if we can cut down on sugar, we don't want diabetes!
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
meHours = 9
if 10 > meHours > 8:
print("experienced with 90k")
else:
if 10 < meHours:
print("experienced with 150k")
else:
print("inexperienced with 50k")
cost = 30
stat = 1
if stat < 1:
print("this product is no good")
else:
if cost > 50 and stat == 1:
print("this product is too expensive")
else:
if 50 > cost > 25 and stat == 1:
print("this is a regular product")
else:
print("this is a cheap product")
questions = {
"Which movie is a comedy?":["a. The King's Man","b. What's eating Gilbert Grape", "c. About Time", "d. Batman"],
"Which movie features 50 Cent?":["a. Shaft", "b. 8 Mile","c. Southpaw", "d. Batman"],
"Who is the best Batman?":["a. Christian Bale","b. Ben Affleck", "c. Robert Pattinson", "d. Kevin Conroy"]
}
answers = {
"Which movie is a comedy?":"c",
"Which movie features 50 Cent?":"c",
"Who is the best Batman?":"d"
}
score = 0
print("Ready for a movie quiz?")
for q,a in questions.items():
print(q)
print(*a)
inp = input("Enter Your Answer")
if(answers.get(q)==inp):
score = score +1
else:
print("SYNTAX ERROR...jk try again")
break
print('Final Score:', score)
questions = {
"Which movie is a comedy?":["a. The King's Man","b. What's eating Gilbert Grape", "c. About Time", "d. Batman"],
"Which movie features 50 Cent?":["a. Shaft", "b. 8 Mile","c. Southpaw", "d. Batman"],
"Who is the best Batman?":["a. Christian Bale","b. Ben Affleck", "c. Robert Pattinson", "d. Kevin Conroy"]
}
answers = {
"Which movie is a comedy?":"c",
"Which movie features 50 Cent?":"c",
"Who is the best Batman?":"d"
}
score = 0
print("Ready for a movie quiz?")
for q,a in questions.items():
print(q)
print(*a)
inp = input("Enter Your Answer")
if(answers.get(q)==inp):
score = score +1
else:
print("SYNTAX ERROR...jk try again")
break
print('Final Score:', score)