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

# In[8]:


# Section 5.7 -- value-returning functions
# idea: A value-returning function...."returns" a value when called
#
# Importing modules (or "packages")
# we've done this before: we've written
# import turtle
# import time
#
# We're gonna look at the random module now
#
# import it:
import random
# Think about modules in this way: 
# a module gives you a "black box" of functions
# meaning that you don't know "how" they work, but you
# can have some confidence that they "do" work
#
# You usually never know 100% how a function in a module works
# but if it functions fine, then don't worry about it!
#
# 
# Examples of functions in the random module
#
# display random number between 1 and 10 (inclusive)
def main():
    number=random.randint(1,10)
    print("The random number is",number)
main()
main()
main()
main()
main()
main()
main()
main()
main()
main()
main()
main()


# In[10]:


# Die rolling program
# Randomly generate two numbers between 1 and 6 and display them
# Ask user if they want to roll again.
#
# magic numbers
MIN=1
MAX=6
def main():
    # loop control variables
    go_again='y'
    while go_again=='y':
        print("Rolling the dice...")
        print("First die roll is",random.randint(MIN,MAX))
        print("Second die roll is",random.randint(MIN,MAX))
        go_again=input("Input y to roll again")
main()


# In[364]:


# Other functions in the random module
# randrange -- behaves similar to range in that the upper value
# is never attained
#
# easiest example
import random
print(random.randrange(7))   # <-- random int in {0,1,2,3,4,5,6}
print(random.randrange(1,5)) # <-- random int in {1,2,3,4}
print(random.randrange(15,30)) #<-- random int in {15,16,...,29}
print(random.randrange(0,10,2)) # <-- random int in {0,2,4,6,...,8}
print(random.randrange(3,15,4)) # <-- random int in {3,7,11}

#
# Above functions always give integer outputs
# What about floats?
#
# Random number in the interval [0,1) -- 0 <= x < 1
# I would use
print(random.random())
# If instead, I want a random number in [A,B) -- A<=x<B,
# then I would use the uniform function
print(random.uniform(5,10))
#
#


# In[442]:


import random
random.seed(10) # will cause these "random" numbers to never change
# this is because "randomness" does not exist in computers
# these are really "pseudorandom" numbers
print(random.randint(5,10))
print(random.randint(5,10))
print(random.randint(5,10))
print(random.randint(5,10))
print(random.randint(5,10))
print(random.randint(5,10))
print(random.randint(5,10))


# In[448]:


# Section 5.8 -- writing a value-returning function
# Syntax
#
# def functionname(parameters):
#     stuff
#     stuff
#     return expression  #<-- this is the key new idea
#
#
# Compare two funcitons that seem similar but aren't
def add_two(num1,num2):
    result=num1+num2
    return result
def add_two_print(num1,num2):
    result=num1+num2
    print(result)
add_two(1,2)
print(add_two(1,2))
add_two_print(2,3)
print(add_two_print(2,3))
var1=add_two(3,5)
var2=add_two_print(10,11)
print("var1 is",var1)
print("var2 is",var2)
print("type(var1) is",type(var1))
print("type(var2) is",type(var2))