poj1047 Round and Round We Go

 1 #include<stdio.h>
 2 #include<string.h>
 3 int main()
 4 {
 5     char s[65],b[65],str[60][65];
 6     int i,k,t,c,len;
 7     bool flag;
 8     while(~scanf("%s",s)){
 9         len=strlen(s);
10         for(i=0;i<len;++i){
11             strcpy(str[i],s+i);
12             strncat(str[i],s,i);
13         }
14         for(k=2;k<=len;++k){
15             memset(b,0,sizeof(b));
16             for(b[len]=c=0,i=len-1;i>=0;--i){
17                 t=(s[i]-'0')*k+c;
18                 b[i]=t%10+'0';
19                 c=t/10;
20             }
21             if(c) break;
22             for(flag=i=0;i<len;++i)
23                 if(!strcmp(b,str[i])){
24                     flag=1;
25                     break;
26                 }
27             if(!flag) break;
28         }
29         if(k>len) printf("%s is cyclic\n",s);
30         else printf("%s is not cyclic\n",s);
31     }
32     return 0;
33 }

//第一次提交第8行的‘~’竟然忘了写了！！结果杯具了半天！！细心啊！！