Lopping over an array c++

for (int i = 0; i < arr.size(); ++i){
//use if we explicitly need the value of i
cout << i << ":\t" << arr[i] << endl;
}
for (int element : arr){
//modifying element will not affect the array
cout << element << endl;
}
for (int &element : arr){
//modifying element will affect the array
cout << element << endl;
}

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