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

# In[12]:


# Section 3.6 -- Boolean variables
# Recall
x=0
y=1
print("type(x<y) is",type(x<y))
print("x<y is",x<y)

# we can use "True" and "False" values any way we wish
hungry=True
sleepy=False
print("type(hungry) is",type(hungry))
if x<y:
    print("x is less than y")
if hungry:
    print("I am hungry")
if not sleepy:
    print("I am not tired.")
#weird
test=x<y
print("type(test) is",type(test))


# In[14]:


# Section 4.1 -- introduction to repetition structures
# Example program - 3 employees, need to compute commission for them
#magic number for commisssion rate

sales1=float(input("What are the sales of the first employee (in $)?"))
comm_rate1=float(input("What is the commission rate of the first employee?"))
commission1=sales1*comm_rate1
print("Commission for the first employee is $",commission1,sep='')

sales2=float(input("What are the sales of the second employee (in $)?"))
comm_rate2=float(input("What is the commission rate of the second employee?"))
commission2=sales2*comm_rate2
print("Commission for the second employee is $",commission2,sep='')

sales3=float(input("What are the sales of the third employee (in $)?"))
comm_rate3=float(input("What is the commission rate of the third employee?"))
commission3=sales3*comm_rate3
print("Commission for the third employee is $",commission3,sep='')

#Two kinds of repetition structures
# 1. condition-controlled
# 2. count-controlled


# In[18]:


# Section 4.2 -- while loops
# Syntax
#
# while condition:
#     stuff
#     stuff
#     other stuff
#
# Redo the commission example with a while loop
#
# define a string for the conditional for the while loop
keep_going='y'
# loop
while keep_going=='y':
    sales=float(input("What are the sales of this employee?"))
    comm_rate=float(input("What is the commission rate of this employee?"))
    commission=sales*comm_rate
    print("This employee received $",commission," of commission.",sep='')
    keep_going=input("Write y to process another employee, write anything else to stop.")
    
    # The while loop is a "pretest loop" meaning it tests the condition
    # before it executes anything.


# In[21]:


# Another program: imagine you work at a chemical facility and 
# your job is to manage a vat of chemicals. Your job is to check
# the temperature of a vat and report that temperature to the computer.
# If temperature is > 102.5 degrees, then you are instructed to turn the
# thermostat down & re-measure the temp 5 minutes later. If the temp is <= 102.5
# then you are told to run program again in 15 minutes.

# magic number
TEMP_CUTOFF=102.5

current_temp=float(input("What is the current temperature?"))
while(current_temp>TEMP_CUTOFF):
    print("Turn thermostat down and report the temperature in 5 minutes.")
    current_temp=float(input("What is the current temperature reading?"))
print("Run this program again in 15 minutes to retest the temperature.")


# In[29]:


# 4.3 for loop -- (count-controlled)
# 
# for var in [value1, value2, value3, ..., value n]:
#     do stuff
#     do stuff
#     etc
#
# A new data type: a "list" is used here
# lists are specified as [value1, value2, value3, ..., value n]
mylist=['a','b',2.1,3.1234,True]
print("type(mylist) is",type(mylist))
print(mylist)
# we can extract the items in a list
#first item
print("type(mylist[0]) is",type(mylist[0]))
print(mylist[0])
#second item
print(mylist[1])
#third item
print(mylist[2])
######
######


# In[42]:


# Printing prime numbers in a list
primes=[2,3,5,7,11,13,17,19,23,29]
for num in primes:
    print(num)
    
# Print people
beatles=['Ringo','Paul','John','George']
for member in beatles:
    print(member)
    
#range function
print("type(range(5)) is",type(range(5)))
print("list(range(5)) is",list(range(5)))
print("list(range(10)) is",list(range(10)))
print("list(range(5,20)) is",list(range(5,20)))
# range(a,b) will give us a list of integers starting at a and ending at b-1
for value in range(5):
    print("Hello world!")


# In[50]:


# Make a table of perfect squares
print("Number \t Square \t Cubes")
print("------------------------------")
for num in range(1,21):
    print(num,"\t",num**2,"\t\t",num**3)


# In[59]:


# User-defined list of squares
firstnum=int(input("What is the starting number for the list of squares?"))
lastnum=int(input("What is the last number for the list of squares?"))
print("Number \t Square")
print("----------------")
for num in range(firstnum,lastnum+1):
    print(num,"\t",num**2)