#include <iostream>  
#include <string.h>  
using namespace std;  
char s[1001];  
int t1,t2,co1,co2,te=0,k;  
int main(void){  
   while(cin>>s){  
      t1=0;  
      t2=0;  
      if(s[0]==48)  
         break;    
         if(strlen(s)%2==0){  
            for(int i =0;i<=strlen(s)-1;i+=2){  
               t1+=s[i]-48;  
               t2+=s[i+1]-48;}  
         }     
         else 
         {  
            for(int i =0;i<=strlen(s)-2;i+=2){  
               t1+=s[i]-48;  
               t2+=s[i+1]-48;  
               k=i;}  
               t1+=s[k+2]-48;      
         }  
      if (t1==t2){  
         te=0; }  
      else {  
         if(t1>t2){  
            if((t1-t2)%11==0){  
               te=0; }  
            else{  
               te=1;}  
            }  
         else{  
            if((t2-t1)%11==0){  
               te=0; }  
            else{  
               te=1;}  
            }                
         }  
         (te==0)?(cout<<s<<" is a multiple of 11."<<endl):(cout<<s<<" is not a multiple of 11."<<endl);  
     
     
   }  
 
} 

為什麼??原本我s陣列設1000

後來改設1001也一樣˙ˇ˙