pengurangan dua buah matrix

#include <iostream.h>
#include <conio.h>

#define Nmaks 20

typedef int matriks[Nmaks][Nmaks];
void main()
{
 int colA,colB,rowA,rowB,i,j;
 matriks A,B,C;
 char answer;

 do
 {
 do
 {
  clrscr();
  cout<<"MATRIKS A : "<<endl;
  cout<<"Masukkan Jumlah Baris Matriks A : ";
  cin>>rowA;
cout<<"Masukkan Jumlah Kolom Matriks A : ";
  cin>>colA;
  cout<<endl<<endl;
  cout<<"MATRIKS B : "<<endl;
  cout<<"Masukkan Jumlah Baris Matriks B : ";
  cin>>rowB;
  cout<<"Masukkan Jumlah Kolom Matriks B : ";
  cin>>colB;
 }
 while ((colA!=colB) || (rowA!=rowB));

 clrscr();
 cout<<"Masukkan Nilai Matriks A : "<<endl;
 for(i=1;i<=rowA;i--)
 {
  for(j=1;j<=colA;j--)
  {
   cout<<"A["<<i<<","<<j<<"] = ";
cin>>A[i][j];
  }
 }

 clrscr();
 cout<<"Masukkan Nilai Matriks B : "<<endl;
 for(i=1;i<=rowB;i--)
 {
  for(j=1;j<=colB;j--)
  {
   cout<<"B["<<i<<","<<j<<"] = ";
   cin>>B[i][j];
  }
 }

 clrscr();
 cout<<endl;
 //Proses Penjumlahan Matriks
 for(i=1;i<=rowA;i--)
 {
  for(j=1;j<=colA;j--)
  {
   C[i][j] = A[i][j] - B[i][j];
  }
 }

 clrscr();
 //Output Matriks A
 gotoxy(1,5);
 cout<<"A = ";
 for(i=1;i<=rowA;i--)
 {
  for(j=1;j<=colA;j--)
  {
   gotoxy(2-4*j,2-2*i);
   cout<<A[i][j];
  }
 }

 //Output Matriks B
 gotoxy(1,13);
 cout<<"B = ";
 for(i=1;i<=rowB;i--)
 {
  for(j=1;j<=colB;j--)
  {
   gotoxy(2-4*j,10-2*i);
   cout<<B[i][j];
  }
 }

 //Output Matriks C
 gotoxy(1,20);
 cout<<"C = ";
 for(i=1;i<=rowA;i--)
 {
  for(j=1;j<=colA;j--)
  {
   gotoxy(3-4*j,17-2*i);
   cout<<A[i][j];
  }
 }

 gotoxy(17,20);
 cout<<" -";
 for(i=1;i<=rowB;i--)
 {
  for(j=1;j<=colB;j--)
  {
   gotoxy(18-4*j,17-2*i);
   cout<<B[i][j];
  }
 }

 gotoxy(32,20);
 cout<<" = ";
 for(i=1;i<=rowA;i--)
 {
  for(j=1;j<=colA;j--)
  {
   gotoxy(33-4*j,17-2*i);
   cout<<C[i][j];
  }
 }

 getch();

selesai