Swap values in array c++

#include <algorithm>
#include <iostream>

using namespace std;

int main()
{
     int array[]={1, 2};
     cout<<array[0]<<" "<<array[1]<<endl;
     swap(array[0], array[1]);
     cout<<array[0]<<" "<<array[1];
     return 0;
}

Source: cplusplus.com

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