15-112: Fundamentals of Programming and Computer Science
Week 3 Practice Problems

• 1-Hour CA-led Large-Group Study Sessions (see hw3 for details)
  
  • changingPropertiesAnimation
    Review changingPropertiesAnimation from class notes here
  • wallWalkingAnimation
    Write the function wallWalkingAnimation(canvas, width, height, step) so that stepAnimation.run(wallWalkingAnimation, width=200,height=100,timerDelay=1) produces the animation described in this video.


• Covered in Recitation
  
  • review s15-quiz2
  • nthPerfect
    Write the function nthPerfect(n) under quiz conditions. A perfect number is a number that is the sum of its proper positive divisors (so 6 is perfect, because 6 = 1+2+3, as is 28 = 1+2+4+7+14).
  • nthSumProductNumber
    Write the function nthSumProductNumber(n) under quiz conditions. Read about sum-product numbers here. Stick to base 10.


• Additional suggested practice
  
  • The graphics problems from here