您的矩阵乘法的代码是错误的。代替：

Your code for multiplication of the matrices is wrong. Instead of:

for (int i = 0; i < a; i++)
{
   for (int j = 0; j < d; j++)
   {
      Mat3[i][j] = Mat1[i][j] * Mat1[i][j];
   }
}

您需要：

for (int i = 0; i < a; i++)
{
   for (int j = 0; j < d; j++)
   {
      Mat3[i][j] = 0;
      for (int k = 0; k < c; k++)
      {
         Mat3[i][j] += Mat1[i][k] * Mat2[k][j];
      }
   }
}