// Oldham, Jeffrey D.
// 2000 Feb 21
// CS1321
//
// Modified by:
// Massingill, Berna L.
// 2001 Feb and 2001 Oct

//
// Example of code using MVector class
//

#include <iostream>
#include <cstdlib>		// has EXIT_SUCCESS
#include "mvector.h"
using namespace std;

int main(void)
{
  // Declaring vectors and assigning values to elements.

  MVector m;
  cout << "An empty vector's original dimensionality is " 
       << m.dim() << endl;  
  m.redimension(4);
  cout << "The vector should now have four elements: " 
       << m.dim() << endl;

  m.set(0, 1.1);
  m.set(1, 2.1);
  m.set(2, 3.1);
  m.set(3, 4.1);
  cout << "The vector's contents: " << m << endl;

  MVector n(m);
  cout << "The copied vector's contents should be the same: " 
       << n << endl;

  MVector p(4);
  cout << "A vector declared with dimensionality 4 has dimensionality "
       << p.dim() << endl;
  p.set(0, 5.1);
  p.set(1, 6.1);
  p.set(2, 7.1);
  p.set(3, 8.1);
  cout << "The second vector's contents: " << p << endl;

  // Arithmetic operations on vectors.

  cout << "addition: " << m + p << endl;
  cout << "subtraction: " << m - p << endl;
  cout << "dot product: " << m * p << endl;
  cout << "scale by 2: " << 2 * m << endl;
  cout << "again: " << m * 2 << endl;
  cout << "add second vector to first, changing first vector: ";
  m += p;
  cout << m << endl;
  cout << "scale first vector, changing it:  ";
  m *= 2;
  cout << m << endl;
  cout << "length of m = " << m.length() << endl;

  // Relational operations on vectors.

  if ((m == m) && !(m != m))
    cout << "A vector equals itself\n";
  if ((m != p) && !(m == p))
    cout << "Two different vectors are not equal\n";

  // Input operation on vector.

  MVector q(4);
  cout << "Enter four numbers for vector:\n";
  cin >> q;
  cout << "The vector is " << q << endl;

  return EXIT_SUCCESS;
}