我想把arr1和arr2相加 输出arr3

Question

#include<iostream>
#include<string>
#include<new>
#include <algorithm>
#include <vector>

using namespace std;
class myarray{
    public:
        myarray();
        myarray(const myarray&m);
        myarray(int len);
        // myarray add(const myarray& a,const myarray& b);
    ~myarray();
    void setdata(int index,double data);
    double getdata(int index);
     double getlen()const;
    int result[];
    double* e;
    
    myarray &operator =(const myarray&);
    int &operator[](int i)const;
    myarray &operator+(const myarray & ma);
    friend ostream & operator << (ostream & os,const myarray & ma);
    friend istream & operator >> (istream & is,const myarray & ma);
    private:
    int len;
    int *space;
};
myarray::myarray(){this->len = 0;this->space = NULL;
}
myarray::myarray(int len)
{
if (len <= 0) {
 this->len = 0; return; }
 else{
this->len = len;
this->space = new int[this->len];
    }
}
myarray::~myarray(){
    if((this->space)!= NULL){
        delete this->space;
        this->space=NULL;
        len = 0;
    }
}
void myarray::setdata(int index,double data){
    if(this->space != NULL){this->space[index]=data;
    }
};
double myarray::getdata(int index){
    return this->space[index];
};
double myarray::getlen()const {return this->len;};

myarray& myarray::operator =(const myarray & m){

if (this == &m) { return *this; }
if (this->space != NULL){
delete[] this->space;
this->space = NULL;
}
}
int & myarray::operator [](int i)const {return this->space[i];}

ostream & operator << (ostream & os,const myarray & ma){
    for (int i=0;i<ma.getlen();i++){
        os<<ma[i]<<"\t";
        
    }
    return os;
} 

istream & operator >>(istream & is,myarray & ma){
    cout <<"输入"<<ma.getlen()<<"个数"<<endl;
    for (int i=0;i<ma.getlen();i++){is>>ma[i];
    } 
    return is;
}

 
myarray &myarray::operator+(const myarray &ma)
{
   myarray *t = new myarray(ma.getlen());
   for (int i = 0; i < ma.getlen(); ++i) 
   {
      t->space[i] = space[i] + ma[i]; 
   }
   return *t; 
}
 



int main(){
    int buff;
    cin>>buff;
    myarray arr1(buff);
    myarray arr2(buff);
    cin>>arr1;
    cin>>arr2;
    cout<<"arr2:"<<arr2<<endl;
    myarray arr3 = arr1 + arr2;
    cout<<"arr1+arr2="<<arr3<<endl;
}