Cartesian Product

#include<bits/stdc++.h>

using namespace std;

int main()

{

    int x,y,i,j;

    cout<<"enter the size of first set : ";

    cin>>x;

    cout<<"Enter the size of second set : ";

    cin>>y;

    int a[x], b[y];

    cout<<"Enter the elements of first set : ";

    for(i=0;i<x;i++)

    cin>>a[i];

    cout<<"Enter the elements of second set : ";

    for(i=0;i<y;i++)

    cin>>b[i];

    cout<<"\nCartesian product from A to B is :"; 

    for(i=0;i<x;i++)

        for(j=0;j<y;j++)

            cout<<"{"<<a[i]<<","<<b[j]<<"}";

    cout<<"\nCartesian product from B to A is :";

    for(i=0;i<y;i++)

        for(j=0;j<x;j++)

            cout<<"{"<<b[i]<<","<<a[j]<<"}";

}