【pta】1031 查验身份证

题目

1031 查验身份证

思路

把权值存入数组a中，把M存入数组b中。对于没有错误的情况，设置一个flag变量，只要有不合格的输出，就把值设为1。

代码

#include<iostream>
using namespace std;
int a[17] = {7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2 };
int b[11] = {1,0,10,9,8,7,6,5,4,3,2};
bool istrue(string s)
{int sum = 0;for (int i = 0;i < s.size()-1;i++){if (!isdigit(s[i]))return false;sum = sum + a[i] * (s[i] - '0');}if ((sum % 11) == 2){if (s[17] != 'X')return false;}else{if (b[sum % 11] != s[17]-'0')return false;}return true;
}
int main()
{int n;cin >> n;string s;int flag = 0;for (int i = 0;i < n;i++){cin >> s;if (!istrue(s)){cout << s << endl;;flag = 1;}}if (flag == 0)cout << "All passed";return 0;
}