笨方法学python - 03

三、数字和数学计算

数学运算符：
+  plus
-  minus
/  slash
*  saterisk
%  percent  
<  less-than
>  greater-than
<= less-than-equal
>= greater-than-equal

运算优先级：parenthese > exponents > multiplication > division > addition > subtraction（括号>指数>乘>除>加>减

输入：

print('I will now count my chickens:')

print('Hens',round(25 + 30 / 6))
print('Roosters',100 - 25 * 3 % 4)

print('Now I will count the egges:')

print(round(3 + 2 +1 - 5 + 4 % 2 - 1 / 4 + 6))

print("What is 3 + 2 ?",3 + 2)
print("What is 5 - 7 ?",5 - 7)

print("Oh, that's why it's False.")

print('How about some more?')

print('Is it greater?',5 > -2)
print('Is it greater or equal?',5 >= -2)
print('Is it less or equal?',5 <= 2)

输出：

I will now count my chickens:

Hens 30
Roosters 97

Now I will count the egges:

7

What is 3 + 2 ? 5
What is 5 - 7 ? -2

Oh, that's why it's False.

How about some more?

Is it greater? True
Is it greater or equal? True
Is it less or equal? False

 

% 在py中是余数符号
x 除以 y 余 J，（100 / 16 余 4），% 运算的结果就是J（4)的这部分