循环分支结构练习

逃离我推掉我的手 2022-05-30 03:05 275阅读 0赞

1.系统登录界面

import getpass
    username = input("请输入用户名:")
    password = getpass.getpass("请输入密码:")
    if username == "admin" and password == "123456":
        print("欢迎使用本系统")
    else:
        print("用户名或密码错误,登录失败!")

2.y = 5 \* x + 3   (x< -1)

y  = 2 \* x - 1   (-1<x<1)

y  = 3 \* x - 5   (x>1)

x = float(input("请输入x的值:"))
    if x < -1:
        y = 5 * x + 3
    elif x < 1:
        y = 2 * x - 1
    else:
        y = 3 * x - 5
    print("y=",y)

3.输入成绩得到对应的等级

grade = int(input("请输入你的成绩:"))
    if 0<=grade < 60:
        print("不及格")
    elif 60<=grade < 70:
        print("中")
    elif 70<=grade < 85:
        print("良")
    elif 85<=grade <=100:
        print("优")
    else:
        print("成绩输入有误")

4.得到随机数,通过分支语句打印出来

from random import random,randint
    x = randint(1, 6)
    if x == 1:
        print(1)
    elif x == 2:
        print(2)
    elif x == 3:
        print(3)
    elif x == 4:
        print(4)
    elif x == 5:
        print(5)
    elif x == 6:
        print(6)

5. 执行60000次1-6的随机整数,得到每一面出现的次数

from random import randint
    
    f1 = 0 
    f2 = 0
    f3 = 0
    f4 = 0
    f5 = 0
    f6 = 0
    num = 0
    while num<= 60000:
        face = randint(1, 6)
        if face == 1:
            f1 += 1
        elif face == 2:
            f2 += 1
        elif face == 3:
            f3 += 1
        elif face == 4:
            f4 += 1
        elif face == 5:
            f5 += 1
        else:
            f6 += 1
        num += 1
    print("1点出现了%d次" % f1)
    print("2点出现了%d次" % f2)
    print("3点出现了%d次" % f3)
    print("4点出现了%d次" % f4)
    print("5点出现了%d次" % f5)
    print("6点出现了%d次" % f6)

6.使用for... in 循环

'''
    print("hello,world! \n" * 10)
    '''
    import time
    for _ in range(30):
        print("hello, world!", sep=":")
        time.sleep(1)

7.得到100以内所有偶数或奇数的总和

my_sum = 0
    for num in range(0, 101, 2):
        my_sum += num
    print(my_sum)
    my_sum1 = 0
    
    for num in range(1, 101, 2):
        my_sum1 += num
    print(my_sum1)
    my_sum2 = 0
    
    for num in range(101):
        if num % 2 == 0 :
            my_sum2 +=num
    print(my_sum2)
    
    my_sum3 = 0
    for num in range(101):
        if num % 3 == 0 or num % 5 ==0 :
            my_sum3 += num
    print(my_sum3)

8.计算出100以内能被3或5整除的整数的和

totalnum = 0
    num = 0
    while num <101:
        if num % 3 == 0 or num % 5 ==0:
            totalnum += num
        num += 1
    print(totalnum)

9.人机猜数字-机器猜

from random import randint
    num_x = randint(0, 100)
    try_time = 0
    while 1:
        num = int(input("请输入你要猜的数字是:"))
        if num_x == num:
            print("恭喜你答对了")
            break
        elif num_x < num:
            print("数字猜大了")
            try_time +=1
            if try_time == 7 :
                print("7次都猜错了,智商着急啊你,不给你猜了")
                break
        elif num_x > num:
            print("数字猜小了")
            try_time +=1
            if try_time == 7 :
                print("7次都猜错了,智商着急啊你,不给你猜了")
                break

10.人机猜数-人猜

#2.反转的猜数字(人出数字计算机猜)
    from random import randint
    from time import sleep
    correct_num = 61
    is_correct = False 
    while not is_correct:
        machine_num = randint(0,100)
        print(machine_num)
        if machine_num == correct_num:
            print("你猜对了")
            is_correct = True
        elif machine_num < correct_num:
            print("数字小了")
        else:
            print("数字大了") 
        sleep(1)

11.人机猜拳

import random
    machine_property = 1000
    my_property = 1000
    while 1:
        #1 是剪刀  剪刀赢布 输石头 平剪刀
        #2 是布    布赢拳   输剪刀  平布
        #3 是拳    拳赢剪刀  输布    平拳
        #定制规则如下
        my_finger = int(input("请输入你的选择:"))
        machine_finger = random.randint(1, 3)
        if my_property < 0 or machine_property <0:
            print("游戏结束")
            break
        elif my_finger == 1 and machine_finger ==2 :
            my_property += 100
            machine_property -=100
            print("电脑输了:我%d元,电脑%d元" % (my_property,machine_property))
        elif my_finger == 1 and machine_finger ==3:
            my_property -= 100
            machine_property += 100
            print("电脑赢了:我%d元,电脑%d元" % (my_property, machine_property))
        elif my_finger == 2 and machine_finger ==1 :
            my_property -= 100
            machine_property +=100
            print("电脑输了:我%d元,电脑%d元" % (my_property,machine_property))
        elif my_finger == 2 and machine_finger ==3:
            my_property += 100
            machine_property -= 100
            print("电脑赢了:我%d元,电脑%d元" % (my_property, machine_property))
        elif my_finger == 3 and machine_finger ==2 :
            my_property -= 100
            machine_property +=100
            print("电脑输了:我%d元,电脑%d元" % (my_property,machine_property))
        elif my_finger == 3 and machine_finger ==1:
            my_property += 100
            machine_property -= 100
            print("电脑赢了:我%d元,电脑%d元" % (my_property, machine_property))
        else:
            print("平局:我%d元,电脑%d元" % (my_property, machine_property))

12.计算个人所得税

salary = float(input("本月收入:"))
    insurance = float(input("五险一金:"))
    diff = salary - insurance - 3500
    if diff <=0:
        tax = 0
        deduction = 0
    elif diff <= 1500:
        tax = 0.03
        deduction = 0
    elif diff <=4500:
        tax = 0.1
        deduction = 105
    elif diff <=9000:
        tax = 0.2
        deduction = 555
    elif diff <= 35000:
        tax = 0.25
        deduction = 1005
    elif diff <= 55000:
        tax = 0.3
        deduction = 2755
    elif diff <= 80000:
        tax  = 0.35
        deduction = 5505
    else:
        tax = 0.45
        deduction = 13505