ex3.py

"""
ex3.py 数字和数学

+ plus
- minus
* asterisk
/ slash
% percent 取模——取余数
< less-than
<= less-than-equal
> greater-than
>= greater-than-equal


PEMDAS = PE(M&D)(A&S)
Parentheses ()
Exponents ** （ ^ = XOR )
Multiplication *
Division /
Addition +
Subtraction -
"""

# explain what to do next: count chickens
print("I will now count my chickens:")

# print the count of hens
print("Hens", 25.0 + 30.0 / 6)
# print the count of roosters
print("Roosters", 100 - 25.0 * 3 % 4)

# tips that the count of eggs
print("Now I will count the eggs:")

# do some calculating about the number of eggs
print(3 + 2 + 1 - 5 + 4 % 2 - 1.0 / 4 + 6)

# compare 3+2 and 5-7
print("Is it true that 3 + 2 < 5 - 7?")

# print the comparative result: False
print(3 + 2 < 5 - 7)

# calculate the answer of 3+2
print("What is 3 + 2?", 3 + 2)
# calculate the answer of 5-7
print("What is 5 - 7?", 5 - 7)

# print the answer why 3 + 2 is not less than 5 - 7
print("Oh, that's why it's False.")

# print more comparision
print("How about some more.")

# the result whether 5 is greater than -2: True
print("Is it greater?", 5 > -2)
# whether 5 is greater than or equal to -2: True
print("Is it greater or equal?", 5 >= -2)
# whether 5 is less than or equal to -2: False
print("Is is less or equal?", 5 <= -2)