# UVa 10929
### 題目連結：[UVa10929](http://domen111.github.io/UVa-Easy-Viewer/?10929)
### 題述：
你的任務是，給你一個正整數 N，判定它是否是 11 的倍數。

---
每列資料有一個正整數 N，N 最大可能到 ***1000*** 位數。

若 N = 0 代表輸入結束。

---
對每個輸入的數，輸出是否為 11 的倍數。輸出格式請參考 Sample Output
### c++ code：

#include<bits/stdc++.h>

using namespace std;

int main() {
//------------------------------------------------
#ifdef local
    freopen("in.txt","r",stdin);
    freopen("out.txt","w",stdout);
#endif
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
//------------------------------------------------
    string a ;
    while ( cin >> a ) {
        int n = 0 ;
        int m = 0 ;
        if ( a == "0" ) {
            break ;
        } else {
            for ( int i = 0 ; i < a.length() ; i += 2 ) {
                n = n + a[i] - 48 ;
            }
            for ( int i = 1 ; i < a.length() ; i += 2) {
                m = m + a[i] - 48 ;
            }
            if ( n > m ) {
                if ( ( n - m ) % 11 == 0 )  {
                    for ( int i = 0 ; i < a.length() ; i++ ) {
                        cout << a[i] ;
                    }
                    cout << " is a multiple of 11." << endl ;
                } else {
                    for ( int i = 0 ; i < a.length() ; i++ ) {
                        cout << a[i] ;
                    }
                    cout << " is not a multiple of 11." << endl ;
                }	
            } else {
                if ( ( m - n ) % 11 == 0 )  {
                    for ( int i = 0 ; i < a.length() ; i++ ) {
                        cout << a[i] ;
                    }
                    cout << " is a multiple of 11." << endl ;
                } else {
                    for ( int i = 0 ; i < a.length() ; i++ ) {
                        cout << a[i] ;
                    }
                    cout << " is not a multiple of 11." << endl ;
                }
            }
        }
    }
}

:::success
**``sample input``**
112233
30800
2937
323455693
5038297
112234
0
:::
:::success
**``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.
:::
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###### tags: `APCS選修` `C++` `UVa`