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

2. 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”)

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

4. 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??

5. 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

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

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

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

9. 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.

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