# 算术运算符， +，  -，  *，  /，  //，  %，  **，  注意//为整除

# 赋值运算符， =， +=， -=， *=， /=， //= ，%=， **=

# 比较运算符， ==， !=， <>， >， >=， <， <=

# 逻辑运算符， and， or， not

# 成员运算符， in， not in

# 身份运算符， is， not is

# 位运算符，   &， |， >>， <<， ^， ~

# 优先级  算术>比较>逻辑>赋值

a = 3

b = 5

print(b // a)  #

a *= 3  #

print(a > b)  # True,9>5

print(3>4 and 4>2)  # False

# 单分支

if 3 > 5:

    print("oh,my gold,it's impossible.")

# 双分支

if 3 > 5:

    print("hehe~")

else:

    print("3<5 is true")

# 多分支及嵌套

age = input("pls type your age:")

sex = input("pls type your sex:")

if int(age) < 0:

    print("you type wrong age.pls input again.")

elif int(age) < 18:

    print("it's a boy.")

else:

    if sex == "man" or sex == "male":　　　　# or为或者的意思

        print("you are %s years old, is a %s" % (age, sex))

    elif sex == "woman" or sex == "female":

        print("you are {} years old ,is a {}".format(age, sex))

    else:

        print("you type wrong sex,pls input again")

# 猜数字小游戏

import random

number = random.randint(1, 100)  # 获取1~100的随机数，包括1和100

while True:

    guess_num = int(input("pls type a number(1-100):"))

    if guess_num > number:

        print("you guess big.pls guesss again.")

        continue

    elif guess_num < number:

        print("you guess small.pls guess again")

        continue

    else:

        print("success,it's {}.".format(guess_num), "you will get a prize")

        flag = input("do you want play again?(y/n):")

        if flag == "y":

            number = random.randint(1, 100)

            continue

        else:

            break

# while practice

# 打印100以内的偶数之和

# 方法一

i = 0

sum = 0

while i <= 100:

    sum += i

    i += 2

print("sum = %d" % sum)

# 方法二

i = 0

sum = 0

while i <= 100:

    if i%2 == 0:

        sum += i

    i += 1

print("sum = %d" % sum)

# 方法三

i = 0

sum = 0

while i <= 100:

    if i%2 == 1:

        i += 1

    else:

        sum += i

        i += 1

print("sum = %d" % sum)