PAI Session 3 (7/22 batch)

1. Python with AI – I
Flow Chart

2. What are flow charts
• A flow chart represents the algorithm using a diagram
• Creating a flow chart helps design the logic of the program

3. Example – Add two numbers given by a user

4. Example – Add two numbers given by a user
Start
Accept first
input: num1

5. Example – Add two numbers given by a user
Start
Accept first
input: num1
Accept second
input: num2

6. Example – Add two numbers given by a user
Start
Accept first
input: num1
Accept second
input: num2
Sum = num1 + num2

7. Example – Add two numbers given by a user
Start
Accept first
input: num1
Accept second
input: num2
Add = num1 + num2
Print Add
Stop

8. Example – Add two numbers given by a user
Start
Accept first
input: num1
Accept first
input: num2
Add = num1 + num2
Print Add
Stop

9. Example – Add two numbers given by a user
Start
Accept first
input: num1
Accept first
input: num2
Add = num1 + num2
Print Add
Stop

10. Basic flow chart symbols
Symbol Purpose Description
Flow line Indicated the flow from one block
to another
Start/Stop Represents the start and end of the
flow chart
Processing Arithmetic operations
Input/Output Input and output operations
Conditional Decision making block

11. Example – Print the maximum between two
numbers Start
Accept first
number: num1
Accept second
number: num2
as input
Print num1
Stop
If
num1>
num2
Print num2
True False

12. Example – Print the maximum between two
numbers Start
Accept first
number: num1
Accept second
number: num2
as input
Print num1
Stop
If
num1>
num2
Print num2
True False
Verify that the flow chart
works correctly for a few
examples
num1 = 10, num2 = 20
num1 = 15, num2 = 5

13. Exercise: Create a flow chart for this problem
• Given 3 numbers, a, b, c, find the maximum value

14. Exercise: Create a flow chart for this problem
• Given 3 numbers, a, b, c, find the maximum value
• Verify that what your flow chart works correctly
• Examples:
• a = 10, b = 20, c = 30
• a = 15, b = 30, c = 5
• a = 40, b =80, c = 120

15. Exercise: Create code
Start
Declare 3
numbers: a, b, c
If a > b
Print b
FalseTrue
If a > c
Print a
If b > cPrint c
Stop
True True
False False

16. Flow Chart: Loops
• Ask user to enter a number
• Print all even numbers between 0 and the number user entered

17. Flow Chart: Loops
Start
User inputs a number num1

18. Flow Chart: Loops
Start
User inputs a number num1
a = 1
If a <=
num1
True Is a
divisible by
2?
Stop
True
Print a
False

19. Flow Chart: Loops
Start
User inputs a number num1
a = 1
If a <=
num1
True Is a
divisible by
2?
Stop
True
Print a
a = a+1
False

20. HW discussion
• Find if a number is prime, how would a flow chart for this look?

21. HW discussion
Start
User inputs a number num1
What is a prime number?

22. HW discussion
Start
User inputs a number num1
a = 1
If a <
num1
True Is num1
divisible by
a?
Print it’s a
prime number
Stop
True
Print it’s not a
prime number
a = a+1

23. How do you check if a string is a palindrome?
• How do you access different characters of a string?

24. How do you check if a string is a palindrome?
• How do you access different characters of a string?
• How do you access several characters in a string as a block?

25. How do you check if a string is a palindrome?
• How do you access different characters of a string?
• How do you access several characters in a string as a block?
• Please create a flowchart of how you would check if something is a
palindrome logically. Then use the above two operations to code the
logic.

26. Lets try it!
http://aiclub.world