每当调用multiply方法时，下一个指针永远不会更新并指向自身，即使程序工作并正确地更新所有内容 .

#include <iostream>
using namespace std; 

class Term{
   public:
        Term(int c, int p);
        Term(const Term &t2);
        Term* next;
        int coefficient, power;
        friend class Polynomial;                
};

Term::Term(const Term &t2){
    this->coefficient = t2.coefficient;
    this->power = t2.power;
    this->next = t2.next;
}

Term::Term(int c, int p){
    coefficient = c;
    power = p;
    next = NULL;
}

class Polynomial{
    public:
        Polynomial(Term t);
        void add(Polynomial p);
        void print();
        Term* poly;
        Polynomial multiply(Polynomial p);
};

Polynomial::Polynomial(Term t){
   poly = &t;
}

Polynomial  Polynomial::multiply(Polynomial p){
    Polynomial temp (Term(0,0));
    Term* temp1 = poly;
    Term* temp2 = p.poly;
    while (temp1 != NULL){
        while(temp2 != NULL){
            int p = temp1->power + temp2->power;
            int c = temp1->coefficient * temp2->coefficient;
            temp.add(Polynomial(Term(c, p)));
            temp2=temp2->next;
        }
        temp1 = temp1->next;
    }
        cout << temp.poly;
    //  temp.print();
    return temp;
}

void Polynomial::add(Polynomial p){
   p.poly->next = poly;
   poly = p.poly;
}

void Polynomial::print(){
   Term* temp = poly;
   while(temp != NULL){
    if (temp->coefficient!=0){
           cout << temp->coefficient << "*x^" << temp->power;
           if(temp->next != NULL) cout << " + ";
       }
    temp = temp->next;   
   }
}

int main(){
    Polynomial p (Term(-10,0));
    p.add(Polynomial (Term(-1,1)));
    p.add(Polynomial (Term(9,7)));
    p.add(Polynomial (Term(5,10)));
    Polynomial pp = p.multiply(p);
    p.print();
    system("pause");
    pp.print();
    return 0;
}

打印方法仅在乘法之前有效，在相乘之后它会无限地打印第一个元素 . 乘法方法应该是无效的，但我试图让它工作，所以我试图让它返回一个新的多项式对象 .

c++ c++11 pointers polynomials