最终为123

1. 设定一个任意数字串，数出这个数中的偶数个数，奇数个数，及这个数中所包含的所有位数的总数，将答案按 “偶-奇-总” 的位序，排出得到新数。重复进行，最后会得到 123。

解法一：

 1 #include<iostream>
 2 #include<string.h>
 3 #include<cstdio>
 4 using namespace std;
 5 int main()
 6 {
 7     char num[100];
 8     for(int i=0; i<100; i++)  //初始化数组
 9     {
10         num[i] = ‘a‘;
11     }
12     int count = 0;
13     int oddCount = 0;
14     int evenCount = 0;
15     int totalNum = 0;
16     printf("请输入数字:");
17     char input;
18     while((input =getchar())!=‘ ‘&&(input!=‘\n‘))
19     {
20             num[count] = input;
21             count++;
22
23     }
24     string LinkStr = "";//最后拼接成的字符串
25     int step = 0;  //总共步数
26     while(LinkStr!="123")
27     {
28         for(int j=0; j<100 && num[j]!=‘a‘; j++)
29         {
30             int k = num[j]-‘0‘;  //将char转化成int
31             if(k%2)
32             {
33                 oddCount++;
34             }
35             else
36             {
37                 evenCount++;
38             }
39         }
40         totalNum = oddCount+evenCount;
41
42         /*下面是将totalcount，oddCount和evenCount组合成 “偶-奇-总”的形式*/
43
44         char t1[100],t2[100],t3[100];
45         string temp1,temp2,temp3;
46         sprintf(t1,"%d",evenCount);
47         sprintf(t2,"%d",oddCount);
48         sprintf(t3,"%d",totalNum);
49         temp1 = t1;
50         temp2 = t2;
51         temp3 = t3;
52         string  temp = temp1+temp2;
53         LinkStr = temp+temp3;
54         step++;
55         cout<<"Step"<<step<<":";
56         cout<<"now the number is:"<<LinkStr<<endl;
57
58         /*重置三个计数变量*/
59         totalNum = 0;
60         oddCount = 0;
61         evenCount = 0;
62
63         /*更新num数组*/
64         for(int i=0; i<20; i++)
65         {
66             num[i] = ‘a‘;
67         }
68         int LinkStrSize = LinkStr.length();
69         for(int i = 0; i<LinkStrSize; i++)
70         {
71             num[i] = LinkStr[i];
72         }
73     }
74     printf("输出结果能为123");
75 }

解法二：

 1 #include <iostream>
 2 using namespace std;
 3
 4 int media(int num)
 5 {
 6     int m = 1;
 7     while(num)
 8     {
 9         num /= 10;
10         m *= 10;
11     }
12
13     return m;
14 }
15
16 int main()
17 {
18     int numb, odd = 0, even = 0, lastNumb = 0;
19     cout<<"please input the number:";
20     cin >> numb;
21     while(numb != lastNumb || numb != 123)
22     {
23         lastNumb = numb;
24         odd = 0;
25         even = 0;
26         while(numb)
27         {
28             if((numb % 10) %2)
29                 odd++;
30             else
31                 even++;
32             numb /= 10;
33         }
34         numb = odd + even;
35         numb = media(numb) * odd + numb;
36         numb = media(numb) * even + numb;
37         cout << "now number is:" << numb << endl;
38     }
39     cout<< numb;
40     return 0;
41 }