#!/usr/bin/env python
# coding: utf-8

# In[6]:


# couple more nested for loops
WIDTH=8
HEIGHT=15
for row in range(HEIGHT):
    for col in range(WIDTH):
        print("*",end='')
    print()
    
for row in range(HEIGHT):
    for col in range(row):
        print("*",end='')
    print()


# In[7]:


# Section 4.8 -- turtle again
#first turtle program
import turtle
import time

#magic numbers
NUM_CIRCLES=10
START_RADIUS=20
OFFSET=10
ANIMATION_SPEED=1

#set up the turtle
turtle.speed(ANIMATION_SPEED)
turtle.showturtle()
time.sleep(5)
#turtle.hideturtle()

radius=START_RADIUS

for count in range(NUM_CIRCLES):
  turtle.circle(radius)

  x=turtle.xcor()
  y=turtle.ycor()
  turtle.penup()
  turtle.goto(x,y-OFFSET)
  turtle.pendown()
  radius+=OFFSET
time.sleep(15)


# In[8]:


# second turtle program
import turtle
import time

#magic numbers
NUM_CIRCLES=100
RADIUS=100
ANGLE=7
ANIMATION_SPEED=0

#set up the turtle
turtle.speed(ANIMATION_SPEED)
turtle.hideturtle()

# Draw some circles, with turtle
# tilted by ANGLE degrees after each
# circle is drawn
for x in range(NUM_CIRCLES):
  turtle.circle(RADIUS)
  turtle.left(ANGLE)

time.sleep(15)


# In[ ]:


# Section 5.1 -- Functions
# idea: to "chunk" a group of statements that
#       exist in a program for doing a specific task
#
# Think: a "real world" pay program
# -- get pay rate               <--
# -- get hours worked           <--
# -- calculate gross pay        <--  each could be a function
# -- overtime pay               <--
# -- withholdings and benefits  <--
# -- net pay                    <--
#
# Benefits of chunking like this:
# -- simpler code
# -- can reuse code
# -- faster development
# -- teamwork facilitation
#
# Two kinds 
# 1. "void" functions -- execute statements but return nothing
#    ex. turtle.circle(5) 
# 2. "value-returning" -- execute statements AND returns a value
#   ex. print("abc") returns abc; float("123") returns 123.0