利用运算符重载 定义多项式加法 返回值出错

Question

class Poly
{
int n;

public:
int *a;
Poly(){}
Poly(int)
{
cout<<"请输入多项式的次数:";
cin>>n;
a =new int [n+1];
cout<<"请依次输入各项系数 不存在该次项则输入0 最高项系数不得为0"< for(int i=0;i {
cout cin>>a[i];
}
}
Poly(const Poly &C)
{
a=C.a;
}
~Poly()
{
delete []a;
}
void output()
{
cout<<"多项式如下:"< //if(a[0]!=0)
cout for(int i=1;i if(a[i]!=0)
cout cout }
Poly operator +(Poly &add)
{
Poly result;
result.n=(n>add.n?n:add.n);
int mi=n result.a=new int[n+1];
for(int i=0;i result.a[i]=a[i]+add.a[i];
if(n>add.n)
for(int i=mi+1;i<=result.n;i++)
result.a[i]=a[i];
else
for(int i=mi+1;i<=result.n;i++)
result.a[i]=add.a[i];
cout<<"a0:"<<result.a[0]<<endl;
result.output();
return result;
}
};
int main()
{
Poly r(1);
r.output();
Poly s(1);
s.output();
Poly t;
t=r+s;
cout<<"t.a0:"<<t.a[0];
t.output();
return 0;
}

Answer 1