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 30Roosters 97Now I will count the egges:7What is 3 + 2 ? 5What is 5 - 7 ? -2Oh, that's why it's False.How about some more?Is it greater? TrueIs it greater or equal? TrueIs 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