uses crt;

var x,y:integer;

begin

readln(x,y);

writeln(x,' ',y);

wrieln(y,' ',x);

readln;

end.

cái đề của bạn nó rất là khặp khiển đấy

#include <bits/stdc++.h>

using namespace std;

int main()

{

long long a,c,tam,x,y;

cin>>x>>y;

a=x;

c=y;

cout<<"a truoc khi doi la:"<<a<<endl;

cout<<"c truoc khi doi la:"<<c<<endl;

tam=a;

a=c;

c=tam;

cout<<"a sau khi doi la:"<<a<<endl;

cout<<"c sau khi doi la:"<<c<<endl;

return 0;

}

#include <iostream>

using namespace std;

int main() {

     int x, y;

     cin >> x >> y;

     int temp = x;

     x = y;

     y = temp;

     cout << "x=" << x << endl;

     cout << "y=" << y << endl;

     return 0;

}

#include <bits/stdc++.h>

using namespace std;

long long x,y;

int main()
{

cin>>x>>y;

swap(x,y);

cout<<x<<" "<<y;

return 0;

}

#include <bits/stdc++.h>

using namespace std;

long long x,y;

int main()

{

cin>>x>>y;

swap(x,y);

cout<<x<<" "<<y;

return 0;

}

#include <bits/stdc++.h>

using namespace std;

long long x,y,tam;

int main()

{

cin>>x>>y;

cout<<"x truoc khi doi la:"<<x<<endl;

cout<<"y truoc khi doi la:"<<y<<endl;

tam=x;

x=y;

y=tam;

cout<<"x sau khi doi la:"<<x<<endl;

cout<<"y sau khi doi la:"<<y;

return 0;

}