Shows zero values

Hi guys: Can any one please tell me what i made mistake as it shows the output zero. Thanks.


#include <iostream>
#include <iomanip>
using namespace test;

int main()
{
      double scores[5][3] = {{75.5, 80.5, 0.0},
                                       {88.5, 89.5, 0.0},
                                        {63.0, 54.0, 0.0},
                                       {100.0, 99.0, 0.0},
                                       {88.5, 88.5, 0.0}};
 
      for (int row = 0; row < 5; row += 1)
            scores[row][0] = scores[row][0] + scores[row][1] / 2;

      cout << endl << fixed << setprecision(1);
      for (int row = 0; row < 5; row += 1)
            cout << "The " << row + 1 << " average: " 
                  << scores[row][2] << endl;

      system("pause");
    return 0;
}