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Intro to Nested Looping

Intro to Nested Looping. Intro to Computer Science CS1510 Dr. Sarah Diesburg. Some Things From PA02. BMI These were continuous regions. Set up your code to handle all areas…. Some Things From PA02. BMI While this is valid mathematically, it is bad form in programming languages.

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Intro to Nested Looping

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  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 calculator program should not print that something is invalid AND calculate the answer…

  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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