std::reverse() in C++

reverse() is a predefined function in header file algorithm. It is defined as a template in the above mentioned header file. It reverses the order of the elements in the range [first, last) of any container.
Note: The range used is [first,last), which contains all the elements between first and last, including the element pointed by first but not the element pointed by last.


void reverse(BidirectionalIterator first, BidirectionalIterator last)
BidirectionalIterator is an iterator that can be used to access any
elements of a container in both forward and backward direction.


Input : 10 11 12 13 14 15 16 17
Output :10 11 12 13 14 17 16 15
reverse(v.begin() + 5, v.begin() + 8);
In the above function, input we have applied reverse() on the vector
from index 5 to index 7.
Therefore when we display the vector we get reverse order
from index 5 to index 7.




// CPP program to illustrate
// std::reverse() function of STL
using namespace std;
int main()
    vector <int> v ;
    // Inserting elements in vector
    for (int i = 0; i < 8; i++)
    cout << "Reverse only from index 5 to 7 in array:\n";
    // Reversing elements from index 5 to index 7
    reverse(v.begin() + 5, v.begin() + 8);
    // Displaying elements of vector
    vector <int> :: iterator it;
    for (it = v.begin(); it != v.end(); it++)
        cout << (*it) << " ";
    // Reversing directly from beginning to end
    cout << "\nReverse full array:\n";
    int a[] = {4, 5, 6, 7};
    std::reverse(std::begin(a), std::end(a));
    // Print the array
    std::cout << a[0] << a[1] << a[2] << a[3] << '\n';
    return 0;



Reverse only from index 5 to 7 in array:
10 11 12 13 14 17 16 15 
Reverse full array:

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