'''  Purpose: demonstrate arithmetic and use of variables
        for naming things
'''

# Introduction to variables for naming values!
# Format is:
    # variable = value
    #

# name some values
a = 13
b =  5

print( "a =", a )
print( "b =", b )

# Since we assigned the value 13 to a, when we print a, it prints the value
# stored in the variable!
# We can use variables to reference specific values we stored in those variables.

input() # input() is a function that wants user input! It's waiting for
# the user to give it some input (keyboard) and when you hit enter,
# it registers that input.

# display some integer calculations
print( 'Integer arithmetic' )

# Notice how our variables/identifiers are on the left and the values are on
# the right.
# The = assigns values on the right to the identifier/name on the left!

total        = a +  b
difference   = a -  b
product      = a *  b
dec_quotient = a /  b
int_quotient = a // b
remainder    = a %  b # This one gives you the remainder after doing a/b
power        = a ** b
# Remember our variables stored the values so get rid of total and
# we're not printing that value anymore.

print(  'a + b  =', total ) # Addition
print(  'a - b  =', difference ) # Subtraction
print(  'a * b  =', product ) # Multiplication
print(  'a / b  =', dec_quotient ) # DECIMAL DIVISION
print(  'a // b =', int_quotient ) # INTEGER DIVISION (chops off decimals)
print(  'a % b  =', remainder ) # MODULUS (remainder operator) - JUST REMAINDER
print(  'a ** b =', power ) # EXPONENTIATION

# Pls learn the % one!!! (ex 5%2 is remainder of 5/2
# so the result is 2 remainder 1 so it gives 5%2 = 1!
    # a%b gives you the remainder of a/b

#
input()

# introduce some other built-in functions
print( 'Some handy functions' )
c =  -10
d = 1.75
e = -1.75

print( "c =", c )
print( "d =", d )
print( "e =", e )

input()
# abs( x ), float( x ) , and int( x ) are built in functions
abs_c = abs( c ) # gives you absolute value of whatever is passed into it
float_c = float( c ) # converts a number to a float (decimal)
int_d = int( d ) # converts a number to an integer

# Run these to see how they work!
# int(3.5) would be 3 (chops off decimals NOT ROUND)
# int(1.9999999) is 1! (just chops off decimals)
# int literally just gives you whatever is before the decimal point

# SNAKE CASE
    # If you want a variable with multiple words or something
    # then use underlines to separate words
    # do_this = 1
    # dontdothispls = 1
    # Both work one's just ugly

# Try:
# a = 2
# print(a)
# a = 3
# print(a)

print( 'abs( c )   =',  abs_c )
print( 'float( c ) =', float_c )
print( 'int( d )   =', int_d )

print()