PAT basic 1031

#include <iostream>#include <string>using namespace std;bool func(string a);int main() {    int n;    int count = 0;    cin >> n;    for (int i = 0; i < n; i++) {        string a;        cin >> a;        if (func(a))            count++;    }    if (count == 0)        cout << "All passed";    return 0;}bool func(string s) {    int sum = 0;    int a[18];    for (int i = 0; i < 17; i++) {        if(!isdigit(s[i])) {            cout << s << endl;            return false;        }        a[i] = s[i] - '0';    }    if (s[17] == 'X')        a[17] = 10;    else        a[17] = s[17] - '0';    int b[17] = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};    for (int i = 0; i < 17; i++) {        sum = sum + a[i] * b[i];    }    sum = sum % 11;    int c[11] = {1, 0, 10, 9, 8, 7, 6, 5, 4, 3, 2};    if (c[sum] != a[17]) {             //a[]存放的是数字化后的身份证号  b[]存放的是权重  c[]存放的模数之后对应的校验码         for (int i = 0; i < 17; i++) {            cout << s[i];        }        if (a[17] != 10)            cout << a[17] << endl;        else {            cout << "X" << endl;        }        return true;    }    else {        return false;    }}