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Intro to Nested Looping

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Presentation on theme: "Intro to Nested Looping"— Presentation transcript:

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


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