Intro to Computer Science & Computer Programming

Session 3 - February 3

Presentation

• PowerPoint deck [pptx file download]
• PDF version
• Video of Session 3, part 1
• Video of Session 3, part 2

References

• pickcode.io online coding platform
• guess_the_number.py

  import random
                          
  def main():
      # make a random number from 1 - 10
      randnum = random.randrange(10) + 1
      # print(randnum)
      for attempt in range(1, 4):
          print("Guess #", attempt)
          guess = int(input("Guess a number between 1 & 10: "))
          if guess == randnum:
              print("You win!")
              break
          elif guess > randnum:
              print("Darn, you guessed too high.")
          else:
              print("Your guess was too low.")
      
      print("The number was", randnum)
  
  main()

• random_walker.py

  import time
  import random
  import os
  
  def disp(WIDTH, HEIGHT, x, y):
      os.system("clear")
      for row in range(HEIGHT):
          for col in range(WIDTH):
              if row == y and col == x:
                  print("@",end='')
              elif row == HEIGHT // 2 and col == WIDTH // 2:
                  print("+",end='')
              else:
                  print(".",end='')
          print()
      return
  
  def main():
      WIDTH = 60
      HEIGHT = 20
  
      x = WIDTH // 2
      y = HEIGHT // 2
      turn = 0
      for step in range(1000):
          direction = random.randrange(4)
          if direction == 0: 
              x = x + 1
          elif direction == 1: 
              y = y + 1
          elif direction == 2: 
              x = x - 1
          else: 
              y = y - 1
          turn = turn + 1
          # disp(WIDTH, HEIGHT, x, y)
          print(x, y, turn)
          time.sleep(0.1)
          if x == WIDTH // 2 and y == HEIGHT // 2:
              break
          
      print("Done after " , turn, "steps!")
  
  
  main()

Homework (optional)