使用类运算符进行矩阵乘法

我正在研究矩阵的乘法它有点像

m5 = m2 * m3;
cout << "m2 * m3 is : " << endl<< m5 << endl;

这是我的代码

const Matrix Matrix::operator*(const Matrix &a)
{
   Matrix temp(a.row,a.col);
   for (int i = 0; i<row; i++)
   {
      for (int j = 0; j<col; j++)
      {
        for (int k = 0; k<a.row; k++)
        {
            temp.data[i][j] = temp.data[i][j] + data[i][k] * a.data[k][j];
        }
      }
  }
 return temp;
}

但是，我的打印功能始终显示错误

ostream& operator<<(ostream &output, const Matrix &a)
{
   for (int i = 0; i < a.row; i++)
   {
      for (int j = 0; j < a.col; j++)
      {
        output << a.data[i][j] << "t";
      }
    output << "" << endl;
   }
   return output;
} 

似乎 a.data[i][j] 有问题，我不知道是什么问题它在加法时工作正常。它显示错误 {data0x005fba90{0xfeeefeee{???}}任何人都可以对这种情况提供任何建议或建议或帮助吗这是我的复制构造函数

 Matrix::Matrix(const Matrix&m2)
{
  row = m2.row;
  col = m2.col;
  setUp(row, col);
  for (int i = 0; i<row; i++)
  {
      for (int j = 0; j<col; j++)
      {
          data[i][j] = 0;
      }
  }  
  for (int i = 0; i < row; i++)
  {
      for (int j = 0; j < col; j++)
      {
        data[i][j] = m2.data[i][j];
      }
  }
}

这是设置和默认值

Matrix::Matrix()
{
 row =0;
 col = 0;
 for (int i = 0; i<row; i++)
 {
    for (int j = 0; j<col; j++)
    {
        data[i][j] = 0;
    }
 }
}
Matrix::Matrix(int a, int b, double d[], int c)
{
 row = a;
 col = b;
 setUp(row, col);
 int counter = 0;
 for (int i = 0; i < row; i++)
 {
    for (int j = 0; j < col; j++)
    {
        data[i][j] = d[counter];
        counter++;
    }
 }
 }

和设置

 void Matrix::setUp(int a, int b)
{
 row = a;
 col = b;
 data = new double*[row];
 for (int i = 0; i < row; i++) data[i] = new double[col];
 }