c++++++++++++++++++++++++

解题思路:

注意事项:

参考代码:

#include<iostream>

#include<string>

using namespace std;

int main()

{

string a, b = "19";

cin >> a;

char s[11] = { '1','0','x','9','8','7','6','5','4','3','2' };

b += a.substr(6, 2);

a.replace(6, 2, b);

int sum =( int(a[0]-'0') * 7 + int(a[1]-'0') * 9 + int(a[2]-'0') * 10 + int(a[3]-'0') * 5 + int(a[4]-'0') * 8 + int(a[5]-'0') * 4 + int(a[6]-'0') * 2 +

int(a[7]-'0') * 1 + int(a[8]-'0') * 6 + int(a[9]-'0') * 3 + int(a[10]-'0') * 7 + int(a[11]-'0') * 9 + int(a[12]-'0') * 10 + int(a[13]-'0') * 5 +

int(a[14]-'0') * 8 + int(a[15]-'0') * 4 + int(a[16]-'0') * 2)%11;

cout << a << s[sum];

return 0;

}