// A program that prints the outer product of two vectors.
//Task: Generalize the given code to take a user input of 2 vectors and prints the matrix formed by them (the outer product) of these two vectors.
#include <iostream>
using namespace std;


int main ()
{
  unsigned int size_v1;
  unsigned int n, m, size_v2;
 // double A= {{5, 10 },{2, 4}};
  /* intialization of vector: */

    cout << " please enter the size of vector 1 = ";
  cin >> size_v1;
  cout << " Please enter the size of vector 2 = ";
  cin >> size_v2;
  cout << size_v1 << "\t" << size_v2 << endl;
  double vec1 [size_v1] ;
  double vec2 [size_v2] ;

 for (n = 0 ; n < size_v1 ; ++n) 
 {
 cout << "enter vec1 [" << n << "] = ";
 cin >> vec1[n];
 } //for loop 
 
 for (m = 0 ; m < size_v2 ; ++m) 
 {
 cout << "enter vec2 [" << m << "] = ";
 cin >> vec2[m];
 } //for loop 
 
 double A[size_v1][size_v2] ; //notice no initialization!
 cout << "\n\n";
 for (unsigned int i =0 ; i < size_v1 ; ++i) 
     {
     for (unsigned int j =0 ; j < size_v2; ++j) 
         {
	A[i][j] = vec1[i]*vec2[j];
	cout << " \t A["<<i<<"]"<<"["<<j<<"] = " << A[i][j] ;
          }//for-j
      cout <<endl; //notice the way to display the matrix entries!
      }//for-i
 
 return 0;
}