基础编程练习题第一波

1、使用while输入1 2 3 4 5 6  8 9 10

count = 1
while count < 11:    
    if count != 7:
        print(count)    
    count = count + 1

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

2、求1-100所有数 的和

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

3、输出1-100内的所有奇数、偶数

i = 1
while i < 101:
    if i % 2 == 0:
        print(i)
    i = i + 1

4、求1-2+3—4+5...99所有数的和

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

i = 0 
s = 0
while i < 100:
    temp = i % 2
    if temp == 0:
        s = s - i
    else:
        s = s + i
    i = i + 1
print(s)

5、用户登录（三次重试机会）

i = 1
while i < 4:
    name = input('请输入用户名:')
    password = input('请输入密码:')
    if  name == 'root' and password == 'root':
        print('登录成功')
        break
    elif i < 3:
        print('请重试')
    elif i == 3:
        print("稍后重试")
    i = i + 1