C++运行在VScode的上面时一直报错，跑不出来

#include <iostream>
#include <math.h>
using namespace std;

class polynomial
{
protected:
    int dgree;      // it is used to store the dgree
    double num[11]; // it is used to store a0,a1,a2...

public:
    polynomial();
    polynomial &operator=(const polynomial &);
    void input();              // have done
    double evaluate(); // have done
    void print();
};

void polynomial::input()
{
    int i;
    for (i = 10; i--; i = 0)
    {
        cout << "please enter the a" << i;
        cin >> num[i];
    }
}

double polynomial::evaluate()
{
    int i;
    double x;
    int ans = 0;
    cout << "please enter your number.";
    cin >> x;
    for (i = 11; i--; i = 0)
    {
        ans = ans + num[i] * pow(x, i);
    }
    return ans;
}

void polynomial::print()
{
    cout << num[10] << "x*x*x*x*x*x*x*x*x*x";
    cout << num[9] << "x*x*x*x*x*x*x*x*x";
    cout << num[8] << "x*x*x*x*x*x*x*x";
    cout << num[7] << "x*x*x*x*x*x*x";
    cout << num[6] << "x*x*x*x*x*x";
    cout << num[5] << "x*x*x*x*x";
    cout << num[4] << "x*x*x*x";
    cout << num[3] << "x*x*x";
    cout << num[2] << "x*x";
    cout << num[1] << "x";
    cout << num[0];
}

int main()
{
    polynomial func;
    func.input();
    func.evaluate();
    func.print();
    return 0;
}

当我点击run code按钮后，终端显示这个页面

想知道怎么解决，是代码出了问题还是配置有问题。谢谢

  polynomial();
    polynomial &operator=(const polynomial &);

这两个函数的函数体呢？

• 这个问题的回答你可以参考下: https://ask.csdn.net/questions/7598744