''' Purpose: introduce relational operators
'''

#  get two numbers from user

print()

a = input( 'Enter string: ' )
b = input( 'Enter string: ' )

# convert inputs to integer
#
# a = int( sa )
# b = int( sb )

#  compare and record results

# This is an introduction to relational operators.
# Logical expressions like a < b evaluate to Python boolean values True or False.
# In Python, there is another type called boolean that is only two values (True/False)
# We can use these logical expressions to test if something is true or false
# So an example is if a = 2 and b = 3, a < b is 2 < 3 and that evaluates to True! So
# b1 is set to True.

b1 = ( a < b )     # < is less than
b2 = ( a > b )     # > is greater than

b3 = ( a <= b )    # <= is less than or equal to
b4 = ( a >= b )    # >= is greater than or equal to

b5 = ( a == b )    # == is equals
b6 = ( a != b )    # != is not equals

#  display results

print( a, '< ', b, ':', b1 )
print( a, '> ', b, ':', b2 )

print()

print( a, '<=', b, ':', b3 )
print( a, '>=', b, ':', b4 )

print()

print( a, '==', b, ':', b5 )
print( a, '!=', b, ':', b6 )

print()

# Comparing Strings:
# Strings are compared character by character.
# a < b < ... z
# ab < ac
# The reason why is because it will compare the first two characters ('a' from string 1 and
# 'a' from string 2 and see they're the same and then compare
# the second two 'b' and 'c' and say "oh! b is before c and b < c" so that entire string
# is less than the second string.
# Likewise
# 'aac' < 'aad'

# '153' < '17' # strings - since the '1's are the same and when it moves to the second characters '5' < '7'
# 153 > 17  # Numbers