stl reverse in c++ code example

Example 1: string reverse stl

int main() { 
    string str = "foobarbaz";
    reverse(str.begin(), str.end()); 
    cout << str; // prints "zabraboof"
    return 0; 
}

Example 2: stl function to reverse an array

reverse(ar , ar + n) ; //ar is the array , n is the size