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

# In[8]:


# Sections 3.3 -- comparing strings
# Consider this code:
# the below code yields "false"
#name1='tom'
#name2='jim'
#print("name1<name2 is",name1<name2) 

#consider this: (yields true)
name1='Tom'
name2='jim'
print("name1<name2 is",name1<name2) 

# Not exactly alphabetical order. It is "ASCII" order
name3='!#'
name4='123'
print('name3<nam4 is',name3<name4)

# Check if two strings are identical
string1='abcd'
string2="abcd"
string3='zugzwang'
print("string1==string2 is",string1==string2)
print("string1==string3 is",string1==string3)


# In[16]:


# password check program
#
# set the secret password
SECRET_PASSWORD='zug zwang'
# get password from the user
inputted_password=input("What is the secret password?")
# compare to secret password
if inputted_password == SECRET_PASSWORD:
    print("You have access to the secrets.")
else:
    print("Incorrect password. Please try again.")


# In[25]:


# Section 3.4 - if, elif, else statements
# structure of if, elif, else---
#
# if condition:
#     stuff
# elif another condition:
#     other stuff
# elif another condition:
#     other other stuff
# .
# .
# .
# else:
#     last stuff

# Grader program
# grade cutoffs
ACUTOFF=90
BCUTOFF=80
CCUTOFF=70
DCUTOFF=60
# Take a score and decide if it is an A, B, C, D, or F
# Get the grade
current_grade=float(input("What is your current grade?"))

# control structure
if current_grade >= ACUTOFF:
    print("You got an A")
elif current_grade >= BCUTOFF:
    print("You got a B")
elif current_grade >= CCUTOFF:
    print("You got a C")
elif current_grade >= DCUTOFF:
    print("You got a D")
else:
    print("You got an F :(")


# In[34]:


# Section 3.5 Logical Operators
# Idea: combine multiple boolean operators into one

# Logical Operators          Meaning
#       and                  both must be true to get true
#        or                  at least one has to be true (both could be true)
#       not                  reverses the truth -- e.g. not == is same as !=

#Examples
x=2
y=3
a=4
b=5
z=2
print('x<y and a<b is',x<y and a<b)
print('x>y and a<b is',x>y and a<b)
print('x==y or x==z is',x==y or x==z)
print('x==y or x==b is',x==y or x==b)
print('not y>x is',not y>x)

# Truth tables
# EXPR | not EXPR
# ---------------
#   T  |   F
#   F  |   T
#
# EXPR1 | EXPR2 | EXPR1 and EXPR2 | EXPR1 or EXPR2
#   T   |   T   |        T        |       T 
#   T   |   F   |        F        |       T
#   F   |   T   |        F        |       T
#   F   |   F   |        F        |       F
#
#
# 


# In[42]:


# Loan program -- check if user qualifies for a loan where qualifies means
#                 salary at least 30,000 and years on job at least 2
# magic numbers
SALARY_CUTOFF=30000
JOBYEARS_CUTOFF=2

#get user information
salary=float(input("What is your annual salary?"))
years=float(input("How many years have you worked in your job?"))

# check the condition of qualification:
if salary >= SALARY_CUTOFF and years >= JOBYEARS_CUTOFF:
    print("Congratulations you owe us money later -- you got the loan.")
else:
    print("we're sorry to tell you you did not get the loan so you can't pay us for 30 years")


# In[43]:


#checking numerical ranges
#How do we check if a number is in a numerical range
#like [20,40] (this is the closed interval of numbers between 20 and 40 including both)?
valuetocheck=float(input("What value do you want to check?"))

if(valuetocheck >= 20 and valuetocheck <= 40): 
    print("The inputted number is in the interval [20,40]") 
else: 
    print("The inputted number is not in the inerval [20,40].")