// A proram that returns the determinant of a 2x2 matrix.
#include <iostream>
using namespace std;

int det_array(double arg[2][2]) 
{
  int return_value =0.0 ;
 for (int n=0; n<2; ++n)
    return_value = arg[0][0]*arg[1][1] - arg[1][0]*arg[0][1];
   return return_value ;
}

int main ()
{
  double A[2][2] = {{5, 10 },{2, 4}};
 
cout << "The determinant of the matrix is = " <<det_array(A) <<endl;

 return 0;
}