ans1

 #include <iostream>

using namespace std;


int main() {

    int arr[10]={4,5,1,2,7};

    int n=5;

    for(int i=0;i<n/2;i++){

        int temp=arr[i];

        arr[i]=arr[n-1-i];

        arr[n-i-1]=temp;

        }

    cout<<"{";

    for(int i=0;i<n-1;i++){

        cout<<arr[i]<<",";

    }

    cout<<arr[n-1]<<"}";


    return 0;

}

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