''' Purpose: naming allows abstraction
'''

# Never name variables max and min as you will never have access to the max and min functions after that!
# max_price and min_age are valid names but max and min (and sum) are not valid names! Don't name variables those!
# import math allows us to access the math library (functions and variables defined within the math library)
# max() and min() are built in and are NOT part of the math library so there is no need to import to use max and min functions.

# get access to Python math computational resources
import math             



# demonstrate the two math constants
print( 'Python approximation of pi:', math.pi )
print( 'Python approximation of Euler\'s number:', math.e )

print()
print()

# show some math computation
a = math.radians( 30 )
b = math.radians( 45 )

# .radians() is a function that returns the radians equivalent of an angle given in degrees.

sin_a = math.sin( a )
tan_b = math.tan( b )

# .sin() is another function that takes in a value and gives us the sin value
print( 'sin( 30 degrees ):', sin_a )
print( 'tan( 45 degrees ):', tan_b )

print()

# show some helpful built-in math / math-like functions

reply = input( 'Enter two numbers: ' )
n1, n2 = reply.split()
n1, n2 = int( n1 ), int( n2 )

# the int() function converts whatever is in the parantheses into an int.
# So when we first get the values, reply.split() assigns n1 and n2 to the respective values of the list elements in order within the list created by
# reply.split() so when we enter string '2 3' it will split it into list elements [ ' 2 ' , ' 3 ' ] and n1, n2 = reply.split()
# will basically look like this:
# n1, n2 = [ '2', '3' ]
# and n1, n2 will get the string values respectively (n1 will get '2' and n2 will get '3')
# we then assign those values to the integer conversions of those strings!

print( 'n1 =', n1 )
print( 'n2 =', n2 )

print()
input( 'Enter when ready. ' )

# These are the max and min functions which take in two numeric values and compute the max and min respectively.
bigger  = max( n1, n2 )
smaller = min( n1, n2 )

print( 'max( n1, n2 ):', bigger )
print( 'min( n1, n2 ):', smaller )

print()
input( 'Enter when ready. ' ) # Lastly, this is the absolute value function which will simply return the absolute value of a number!

pos_n1 = abs( n1 )
pos_n2 = abs( n2 )

print( 'abs( n1 ):', pos_n1 )
print( 'abs( n2 ):', pos_n2 )

print()