/* This program creates three vectors a, b, c of size n, and compute */
/* the vector c = 2 * a + b.           n is inputed by the user      */

#include <iostream>
using namespace std;

int main( )
{int n, i;
 double *a, *b, *c;
 cout << "Please enter the size of the vectors: "<<endl;
 cin >> n;

 a = new double[n]; // dynamically allocate array
 b = new double[n]; 
 c = new double[n]; 

 cout << "Input the values for the vector a with size " << n <<endl;
 
 for(i=0; i<n; i++)
  {   cin >> a[i];
  }

 cout << "Input the values for the vector b with size " << n <<endl;

 for(i=0; i<n; i++)
  {   cin >> b[i];
  }

 // compute the vector c

 for(i=0; i<n; i++)
  { c[i] = 2 * a[i] + b[i];
  }

 cout << " the vector c is: " << endl;
 for(i=0; i<n; i++)
  {   cout << c[i] << ' ';
  } 
 cout << endl;

 // return the memory to the heap
 delete [] a; 
 delete [] b;
 delete [] c;

 return 0;

}