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

1 count = 1
2 while count < 11:    
3     if count != 7:
4         print(count)    
5     count = count + 1

1版

1 count = 1
2 while count < 11:
3     if count == 7:
4         count = count + 1
5         continue
6     print(count)
7     count = count + 1

2版

2、求1-100所有数的和

1 i = 0
2 sum = 0
3 while i < 101:
4     sum = sum + i
5     i = i + 1
6     print(i)
7     print(sum)
8 print(sum)

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3、输出1-100内的所有奇数、偶数

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

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4、求1-2+3—4+5...99所有数的和

 1 i = 1
 2 sum1 = 0
 3 sum2 = 0
 4 while i < 100:
 5     if i % 2 == 0:
 6         sum1 = sum1 -i
 7     else:
 8         sum2 = sum2 + i
 9     i = i + 1
10 print(sum1 + sum2)

1版

 1 i = 0 
 2 s = 0
 3 while i < 100:
 4     temp = i % 2
 5     if temp == 0:
 6         s = s - i
 7     else:
 8         s = s + i
 9     i = i + 1
10 print(s)

2版

5、用户登录（三次重试机会）

 1 i = 1
 2 while i < 4:
 3     name = input(\'请输入用户名:\')
 4     password = input(\'请输入密码:\')
 5     if  name == \'root\' and password == \'root\':
 6         print(\'登录成功\')
 7         break
 8     elif i < 3:
 9         print(\'请重试\')
10     elif i == 3:
11         print("稍后重试")
12     i = i + 1

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