測定11的倍數

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題目:從檔案讀取數字，可以判斷1000位數的數字是否為11的倍數

Description

Your job is, given a positive number N, determine if it is a multiple of eleven.

Input

The input is a file such that each line contains a positive number. A line containing the number 0 is the end of the input. The given numbers can contain up to 1000 digits.

Output

The output of the program shall indicate, for each input number, if it is a multiple of eleven or not.

Sample Input
112233
30800
2937
323455693
5038297
112234
0
Sample Output
112233 is a multiple of 11.
30800 is a multiple of 11.
2937 is a multiple of 11.
323455693 is a multiple of 11.
5038297 is a multiple of 11.
112234 is not a multiple of 11.

1. #include <iostream>
   
2. #include <fstream>
   
3. #include <string>
   
4. using namespace std;
   
5. int main()
   
6. {
   
7.     //ifstream cin("numbers.txt",ios::in);
   
8.     string s;
   
9.     while (cin >> s) {
   
10.         if(s=="0") break;
    
11.         int sum[2]={0,0};
    
12.         for (int i=0; i<s.length(); i++) {
    
13.             int n1 = s[i];
    
14.             sum[i%2] = sum[i%2] + n1 -'0';
    
15.         }
    
16.         if ((sum[0]-sum[1])%11==0)
    
17.            cout <<  s << " is a multiple of 11.\n";
    
18.         else
    
19.             cout <<  s << " is not a multiple of 11.\n";
    
20.     }
    
21.     //system("pause");
    
22.     return 0;
    
23. }

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