while 循环练习题

Posted 2020-10-21 lara0520

一、用户交互.input

变量将运算的中间结果暂存在内存，以便后续程序调用

一、使用while循环输入 1 2 3 4 5 6 7 8 9 10

count = 1
while count < 11:
    if count == 7:
        count += 1
        continue
    print(count)
    count +=1
else:print("end")

二、求1-100的所有数的和

count = 1
sum = 0
while count < 101:
    sum = sum + count
    count += 1
print(sum)


三、输出1-100内的所有奇数

count = 1
while count < 101:
    if count %2 == 1:
        print(count)
    count += 1
print("end")


四、输出1-100内所有偶数

count = 1
while count < 101:
    if count %2 ==0:
        print(count)
    count += 1
print("end")


五、求1-2+3-4+5....99的所有数的和

#方法一

sum = 0 
count = 1
while count < 100:
    if count %2 == 0:
        sum = sum - count
        print(sum)
    elif count %2 == 1:
        sum = count + sum
        print(sum)
    count += 1
print(sum)


#方法二

sum1 = 0
sum2 = 0
count = 1
while count < 100:
    if count %2 == 1:
        sum1 = sum1 + count
    else:
        sum2 = sum2 + count
    count += 1
print(sum1 - sum2)



六、用户登陆（三次机会重试）

count = 1
while count < 4:
        name = input("please input your name=")
        password = input("please input your password=")
        if name == "xue" and password == "123":
            print("登陆成功")
            break
        else:
            print("登陆失败")
        count += 1
    
        
七、第六题基础增加，字符串拼接

count = 3
while count > 0:
        name = input("please input your name=")
        password = input("please input your password=")
        if name == "xue" and password == "123":
            print("登陆成功")
            break
        else:
            count -= 1
            if count == 0:
                print("登陆失败")
            else:
                print("还剩"+ str(count) + "次")
        


#ps：字符串拼接,相乘。可相加相乘知识点

name = input("please your name ")
age = input("please your age")

print("你的名字" + name , "你的年纪" + age)

i = "name"
print(name * 8)
”“”



     

View Code

 

ps:python3 input

python2 raw_input

二、if语句.

三、while.

while 条件:
结果

结束循环:
1,改变条件.
2,break

break continue
break:在循环当中,遇到break,直接退出
continue:结束本次循环,继续下一次循环.