Cartesian product of Two set | with Simple code

Cartesian product definition
The Cartesian product X×Y between two sets X and Y is the set of all possible ordered pairs with first element from X and second element from Y:
X×Y={(x,y):x∈X and y∈Y}. Example:- There are A and B are two sets- A = {1,2}; B = {3,4}
Cartesian product (A × B) = {1,2} × {3,4} = {(1,3), (1,4), (2,3), (2,4)}

  // C++ Program to find the Cartesian Product of Two Sets
  #include <stdio.h>
  int main()
  {
    int a[10], b[10], n1, n2;
    printf("Enter size of set A\n");
    scanf("%d", &n1);
    printf("Enter element of set A\n");
    for (int i = 0; i < n1; i++)
      scanf("%d", &a[i]);
    printf("Enter size of set B\n");
    scanf("%d", &n2);
    printf("Enter element of set B\n");
    for (int i = 0; i < n2; i++)
      scanf("%d", &b[i]);
  
    // logic for cartesian product
    printf("cartesian product is : ");
    printf("{");
    for (int i = 0; i < n1; i++)
    {
      for (int j = 0; j < n2; j++)
      {
        printf(" (%d %d) ", a[i], b[j]);
      }
    }
    printf("}");
    return 0;
  }

When the above program is executed, it produces following results --<\b>

  Enter size of set B
  2
  Enter element of set B
  6
  5
  cartesian product is : { (2 6)  (2 5)  (3 6)  (3 5)  (4 6)  (4 5) }