Exercise 6 : Operators

Test :

1. floor 除法 : 返回最近的整数

   3.0 // 2.0 #1.0

2. a < b < c 等价于 a < b and b < c

3. 5 ** -2 #0.04

4. not 1 or 0 and 1 or 3 and 4 or 5 and 6 or 7 and 8 and 9

   4 (preference : not > and > or )

   and 和 or 均返回决定表达式结果的值

   x and y ,x 为真，返回y；x为假，返回x

   x or y, x为真，返回x；x为假，返回y

   not x , x为真，返回False；x为假，返回True

Try :

100以内的奇数：

i = 0
while i<100:
    if i%2 !=0:
        print(i, ' ')
        i += 1
    else:
        i += 1

中国剩余定理问题 :

i = 1
while i < 2000:
    if (i % 2 == 1) and (i % 3 == 2) and (i % 5 == 4) and (i % 6 == 5) and (i % 7 == 0):
        print(i)
        i += 1
    else:
        i += 1

x = 7
i = 1
flag = 0
while i<= 1000:
    if (x%2 ==1) and (x%3 == 2) and (x%5 == 4) and (x%6 == 5):
        flag = 1
    else:
        x = 7 * (i+1)
    i += 1

if flag == 1:
    print('阶梯数为：', x)
else:
    print('No result!')