Bài tập C++ - Trừ hai ma trận trong C++

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

int main() {
   int i, j, matrix1[100][100], matrix2[100][100], matrix3[100][100];
   int row1, col1, row2, col2;

   cout << "Tru hai ma tran trongC++: \n";
   cout << "Nhap so hang cua matrix1: ";
   cin >> row1;
   cout << "Nhap so cot cua matrix1: ";
   cin >> col1;

   cout << "Nhap so hang cua matrix2: ";
   cin >> row2;
   cout << "Nhap so cot cua matrix2: ";
   cin >> col2;

   /*
   * Truoc khi nhap cac phan tu, kiem tra xem so hang va so cot
   * cua hai ma tran co bang nhau khong 
   */
   if (row1 != row2 || col1 != col2) {
      cout << "\nHai ma tran khong cung kich co!";
      exit(0);
   }

   //Nhap cac phan tu cua ma tran 1
   printf("\nNhap ma tran 1\n");
   for (i = 0; i < row1; i++) {
      for (j = 0; j < col1; j++) {
         printf("Nhap phan tu matrix1[%d][%d]: ", i, j);
         cin >> matrix1[i][j];
      }
   }

   //Nhap cac phan tu cua ma tran 2
   printf("\nNhap ma tran 2\n");
   for (i = 0; i < row2; i++)
      for (j = 0; j < col2; j++) {
         printf("Nhap phan tu matrix2[%d][%d]: ", i, j);
         cin >> matrix2[i][j];
      }

   //Tru hai ma tran
   for (i = 0; i < row1; i++)
      for (j = 0; j < col1; j++) {
         matrix3[i][j] = matrix1[i][j] - matrix2[i][j];
      }

   //Hien thi ma tran ket qua
   printf("\nKet qua cua phep tru hai ma tran la: \n");
   for (i = 0; i < row1; i++) {
      for (j = 0; j < col1; j++) {
         printf("%d\t", matrix3[i][j]);
      }
      printf("\n");
   }

   return 0;
}