1. Intro to Nested Looping
Intro to Computer Science
CS1510
Dr. Sarah Diesburg

2. Some Things From PA02 BMI These were continuous regions.
Set up your code to handle all areas…

3. Some Things From PA02
BMI
While this is valid mathematically, it is bad form in programming languages.
And it causes real problems when not set up properly.

4. Some Things From PA02
BMI
Recognize that these are four related categories. This makes it much easier to use if/elif/else.

5. Some Things From PA02
BMI
Recognize that these are four related categories. This makes it much easier to use if/elif/else.

6. Some Things From PA02
BMI
Recognize that these are four related categories. This makes it much easier to use if/elif/else.

7. Some Things From PA02
Watch for messages that can only be printed under certain circumstances
The triangle program should not print that something is an invalid triangle AND a right triangle…

8. Nesting Nesting means to place one code structure inside of another
Nested if statements
If (a<1):
if (a==0):
print(“Hey, this is zero”)
else:
print(“This is a negative number”)

9. Nested Loops
We can also nest loops
Can be very powerful, but tricky!

10. The idea of nested looping
for x in range(1,4): for y in range(1,5): print (x, '*' , y , '=' , (x*y)) How many times will this print??

11. Finding Out if a Number is Prime
An integer, N, is prime if it is not evenly divisible by any of the numbers from 2 to N-1

12. Finding Out if a Number is Prime
Is 41 a prime number?
Is 77 a prime number?

13. Finding Out if a Number is Prime
Is 413 a prime number?
Is 419 a prime number?

14. Let’s Write a Design Paragraph
Inputs?
Steps to calculate result
Outputs?

15. Finding Out if a Number is Prime
Write a program that:
Asks for an integer greater than 2
Keeps prompting until it gets one
Checks the numbers from 2 to N-1 to see if N is evenly divisible by that number
Prints a message either way.

16. So how would we change this…
To print information about all of the numbers from 2 to 100?
Nested Looping