C++ While usin ...
While using a variable reference, what will happen after compilation and execution of the code: 
int arr[]={1,2,3};
for(int &i:arr){
    i=99;
}
for(int i=0;i<3;i++)
    cout<<arr[i]<<'\t';
Explanation
As in the first for expression used not a variable, but a variable reference, then the changes will be stored in the array elements (standard C ++ 11).
loops references iterator

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