Program Fails in Runtime

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C++

When i compiles this code i get 0 errors and some warnings (31) however it allows me to enter the dimensions of the first matrix prompt user for size of second matrix but closes immediately, can...

void main()
{
int x,y,i,j;
  int cols;
   int rows;
    char ch;
  do
  {




   .....
      cout<<"\n*********************************************************"<<endl;
      cout<<"\n^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"<<endl;
      cout<<"\n*********************************************************"<<endl;


      cout<<"\nTHIS ASSIGNMENT IS TO COVER THE FOLLOWING: "<<endl;
      cout<<"\n                         > Find and displaying Determinant"<<endl;
      cout<<"\n                         > Find and displaying the Inverse"<<endl;
      cout<<"\n                           matrix"<<endl;
      cout<<"\n                         > Carrying out row transformation"<<endl;
      cout<<"\n                         > Addition & Subtraction"<<endl;
      cout<<"\n                         > Multiplicationn & division"<<endl;
      cout<<"\n"<<endl;
    cout<<"\n1.Add matrices\n2.Subtract matrices\n3.Multiplymatrices\n4.Find determinant\n5.Find INverse"<<endl;
    cout<<"Select any one above , then hit ENTER"<<endl;
    cin>>x;
    if(x==1)
    {cout<<"enter the dimension of matrix A:";
    cin>>rows>>cols;
    Matrix A ;//= Matrix(rows, cols);
    cout<<"enter the elements of matrix A:";
    for (int r = 0; r < rows; r++)
     { for (int c = 0; c < cols; c++)
       {
        cin>>A(r,c);
       }
     }
    cout<<"enter the dimension of matrix B:";
    Matrix B = Matrix(cols, rows);
    cout<<"enter the elements of matrix B:";
    for (int r=0;r<rows;r++)
     { for (int c=0;c<cols;c++)
       {
        cin>>B(r,c);
       }
  .............
    }
    else if(x==2)
  {  cout<<"enter the dimension of matrix A:";
    cin>>rows>>cols;
    Matrix A = Matrix(cols, rows);
    cout<<"enter the elements of matrix A:";
    for (int r=0;r<rows;r++)
     { for (int c=0;c<cols;c++)
       {
        cin>>A(r,c);
       }
     }


    Matrix B = Matrix(cols, rows);
    cout<<"enter the elements of matrix B:";
    for (int r=0;r<rows;r++)
     { for (int c=0;c<cols;c++)
       {
        cin>>B(r,c);
       }
     }
    Matrix C;
     C = A - B;
    printf("A - B = \n");
    C.Print();
    printf("\n");
  }
   else if (x==3)
   {
     cout<<"enter the dimension of matrix A:";
    cin>>rows>>cols;
    Matrix A = Matrix(cols, rows);
    cout<<"enter the elements of matrix A:";
    for (int r=0;r<rows;r++)
     { for (int c=0;c<cols;c++)
       {
        cin>>A(r,c);
       }
     }


    Matrix B = Matrix(cols, rows);
    cout<<"enter the elements of matrix B:";
    for (int r=0;r<rows;r++)
     { for (int c=0;c<cols;c++)
       {
        cin>>B(r,c);