第21167题
将输入的十进制正整数转化为二进制表示,补全main函数循环输出二进制位的代码,横线上应填入的代码为?
#include <iostream>
using namespace std;

stack<int> ten2bin(int n) {
    stack<int> st;
    int r, m;

    r = n % 2;
    m = n / 2;
    st.push(r);

    while (m != 1) {
        r = m % 2;
        st.push(r);
        m = m / 2;
    }
    st.push(m);
    return st;
}

int main() {
    int n;
    cin >> n;
    stack<int> bin;
    bin = ten2bin(n);
    while (!bin.empty()) {
        _____________________ // 在此处填入代码
    }
    return 0;
}
A

cout << bin.top(); bin.pop();

B

bin.pop(); cout << bin.top();

C

cout << bin.back(); bin.pop();

D

cout << bin.front(); bin.pop();