这是一个求水仙花数的题目（21的位的水仙花数）我想问这是什么问题啊？

我想问这到底是什么问题啊？请大家看看！

这是my.h文件

1 void add(char num1[],char num2[],char score[]); 

2 void remove(char num[]);

3 void getbuffer(char buffer[],char num[],int len);

 4 void carry(char buffer2[],char numbuffer[],int &n); 

5 void add0(char buffer2[]);

 6 void addremain(char num[],int len,char score[],int n);

 7 void getthis(int i,char score[],char num[][25]);

   #include<stdio.h>
 2 #include<string.h>
 3 #include<stdlib.h>
 4 #include"my.h"
 5 void add(char num[],char num2[],char score[])
 6 {
 7     char num1[25];
 8     strcpy(num1,num);
 9     int len1,len2,n=0,k,j;
 10     char buffer1[5],buffer2[5],temp[25];
 11     len1=strlen(num1);
 12     len2=strlen(num2);
 13     score[0]='\0';
 14     temp[0]='\0';
 15     while(len1>0&&len2>0)
 16     {
 17     
 18 
 19     getbuffer(buffer1,num1,len1);
 20     getbuffer(buffer2,num2,len2);
 21     len1-=3;len2-=3;
 22     k=atoi(buffer1);j=atoi(buffer2);
 23     carry(temp,score,n);
 24     itoa(k+j+n,temp,10);
 25     n=0;
 26     add0(temp);
 27     }
 28     carry(temp,score,n);
 29     if(len1>0)
 30     {
 31         addremain(num1,len1,score,n);
 32     n=0;
 33     }
 34     if(len2>0)
 35     {
 36     addremain(num2,len2,score,n);
 37     n=0;
 38     }
 39     if(n!=0)
 40     {
 41         itoa(n,temp,10);
 42         strcat(temp,score);
 43         strcpy(score,temp);
 44     }
 45     remove(score);
 46 }
 47 void getbuffer(char buffer[],char num[],int len)
 48 {
 49     
 50     if(len>3)
 51         {
 52         strncpy(buffer,num+len-3,3);
 53         buffer[3]='\0';
 54         }
 55         else
 56         {
 57         strncpy(buffer,num,len);
 58         buffer[len]='\0';
 59         }
 60 }
 61 void carry(char buffer2[],char numbuffer[],int &n)
 62 {
 63     if(strlen(buffer2))
 64         {
 65         if(strlen(buffer2)>3)
 66         {
 67         strcat(buffer2,numbuffer);
 68         n=buffer2[0]-48;
 69         strcpy(numbuffer,buffer2+1);
 70         }
 71         else
 72         {
 73         strcat(buffer2,numbuffer);
 74         strcpy(numbuffer,buffer2);
 75         }
 76         }
 77 }
 78 void add0(char buffer2[])
 79 {
 80     if(strlen(buffer2)<2)
 81         {
 82         buffer2[2]='\0';
 83         buffer2[1]=buffer2[0];
 84         buffer2[0]='0';
 85         }
 86         if(strlen(buffer2)<3)
 87         {
 88         buffer2[3]='\0';
 89         buffer2[2]=buffer2[1];
 90         buffer2[1]=buffer2[0];
 91         buffer2[0]='0';
 92         }
 93 }
 94 void addremain(char num[],int len,char score[],int n)
 95 {
 96     char buffer[25];
 97     if(len!=0)                     
 98     {
 99     
100     int k=num[len-1]-48+n;
101     itoa(k%10,buffer,10);
102     strcat(buffer,score);
103     if(k>9)
104     {
105     len--;
106     addremain(num,len,buffer,k/10);
107     strcpy(score,buffer);
108     }
109     else
110     {
111     strncpy(score,num,len-1);
112     score[len-1]='\0';
113     strcat(score,buffer);
114     }
115     }
116     else
117     {
118         itoa(n,buffer,10);
119         strcat(buffer,score);
120         strcpy(score,buffer);
121     }
122     
123  }
124 void remove(char num[])
125 {
126 if(num[0]=='0')
127     {
128         char buffer[25];
129         if(num[1]=='0')
130         {
131         strncpy(buffer,num+2,strlen(num)-2);
132         buffer[strlen(num)-2]='\0';
133         }
134         else
135         {
136     strncpy(buffer,num+1,strlen(num)-1);
137     buffer[strlen(num)-1]='\0';
138         }
139     strcpy(num,buffer);
140     }
141 
142 }
143 void main()
144 {
145 char num[10][25];
146 char temp[25];
147 char score[25];
148 for(int i=0;i<10;i++)
149 {
150 num[i][0]=i+48;
151 num[i][1]='\0';
152 }
153 
154 for(int i=2;i<10;i++)
155 {
156     strcpy(score,num[i]);
157     for(int k=0;k<20;k++)
158     {
159 for(int j=0;j<i-1;j++)
160 {
161 
162     add(score,num[i],score);
163 }
164 strcpy(num[i],score);
165     }
166 }
167 
168 for(int j=9;j>=0;j++)
169 {
170 strcpy(score,num[j]);
171 getthis(1,score,num);
172 }
173 }
174 
175 void getthis(int i,char score[],char num[][25])
176 {
177     char temp[25];
178 if(i<21)
179 {
180     for(int i=9;i>=0;i--)
181     {   strcpy(temp,score);
182         add(temp,num[i],temp);
183         if(strlen(temp)<22)
184             getthis(i+1,temp,num);
185     }
186 }else
187 {
188 if(strlen(score)==21)
189 {
190     puts(score);
191 }
192 }
193 }