题解 | #奇偶校验#

#include <bits/stdc++.h>
#define MAX 10
using namespace std;
int res[MAX];

int d2b(int n) {
    int i = 0;
    memset(res, 0, sizeof(res));
    while (n) {
        res[i++] = n % 2;
        n /= 2;
    }
    int sum = 0;
    for (int j = i - 1; j >= 0; j--)
        if (res[j] == 1)
            sum++;
    if (sum % 2 == 0)  //偶数个1
        return 0;
    else
        return 1;
}

int main() {
    string s;
    while (cin >> s) {
        for (int i = 0; i < s.size(); i++) {
//          cout<<(int)s[i]<<endl;
            if (!d2b((int)s[i]))
                res[7] = 1;
            for (int i = 7; i >= 0; i--)
                cout << res[i];
            cout << endl;
        }

    }

}