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Intro to Nested Looping

Learn about nested looping, if statements, and prime number calculations in computer science with examples, best practices, and exercises.

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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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