c++ - Array of objects not working correctly -

i have class creates array of objects class(the array class friend)

class vector_xxl {         int i=0,n=0;          xxl_nr *xxlvector;  public:     vector_xxl(int y)     {         n = y;       xxlvector = new xxl_nr[y];} 

n size of array. xxl_nr class creates large numbers represented linked list(each digit has spot on list)

i want product of each 2 numbers 2 array objects on same positions. so, example, v[i]*d[i] , = 0,n;

this function should doesn't work correctly:

void produs_scalar(vector_xxl a) {     xxl_nr temp(2),temp1(2),temp2(2),result(2);     vector_xxl vector_result(n);      temp1 = this->xxlvector[0];     temp2 = a.xxlvector[0];     temp1.addition(temp2);      for(i=0;i<n;i++)     {   temp = this->xxlvector[i].product(a.xxlvector[i]);         vector_result.xxlvector[i] = temp;     }      for(i=0;i<n;i++)         result= temp.product(vector_result.xxlvector[i]);      result.print();  } 

i used temp1, , temp2 test if can use product method(defined in class xxl_nr) on 2 xxl_nr variables. result same. problem is, in first loop, product, returns correct answer `this->xxlvector[i].product(a.xxlvector[i]); not move i-th position, entire program hangs there after product method returns. now, believe array problem, because tried doing product without using array(just xxl_nr types) , method doesn't hang anymore. example:

void produs_scalar()//vector_xxl &a) {     xxl_nr b(2), c(2), d;     cout<<"insert number b";     cin>> b;     cout<<"number c";     cin>>c;     d=b.product(c);     cout<<d; 

here, works fine. product methos returns, , code adcances cout<<d; .

i read on 1 topic when program hangs it's because of pointing random memory , program hangs, have no idea how debug or how verify if that's case.

the assignment 'temp' product incorrect. in array demonstration assign result of 'product' type xxl_nr(2) while in example no arrays assigning result type xxl_nr. without code xxl_nr unclear type being created.