How to Iterate Over a Vector in Reverse Order in C++ - Step by Step Examples

How to Iterate Over a Vector in Reverse Order in C++ ?

Answer

To iterate over a vector in reverse order in C++, you can use a reverse iterator along with the rbegin() and rend() member functions of the vector.

✐ Examples

1 Iterate Over a Numeric Vector in Reverse Order

In this example,

We create a vector named numVec containing several numeric values.
We use a reverse iterator rit initialized to numVec.rbegin(), which points to the last element of the vector.
We iterate over the vector in reverse order by comparing rit to numVec.rend(), which points to one position before the beginning of the vector.
Inside the loop, we print each element pointed to by rit, effectively traversing the vector in reverse order.

C++ Program

#include <iostream>
#include <vector>

int main() {
    std::vector<int> numVec = {10, 20, 30, 40, 50};
    for (auto rit = numVec.rbegin(); rit != numVec.rend(); ++rit) {
        std::cout << *rit << std::endl;
    }
    return 0;
}

Output

2 Iterate Over a String Vector in Reverse Order

In this example,

We create a vector named strVec containing several string values.
We use a reverse iterator rit initialized to strVec.rbegin(), which points to the last string element of the vector.
We iterate over the vector in reverse order by comparing rit to strVec.rend(), which points to one position before the beginning of the vector.
Inside the loop, we print each string element pointed to by rit, effectively traversing the vector in reverse order.

C++ Program

#include <iostream>
#include <vector>
#include <string>

int main() {
    std::vector<std::string> strVec = {"apple", "banana", "cherry", "date"};
    for (auto rit = strVec.rbegin(); rit != strVec.rend(); ++rit) {
        std::cout << *rit << std::endl;
    }
    return 0;
}

Output

date
cherry
banana
apple

Summary

In this tutorial, we learned How to Iterate Over a Vector in Reverse Order in C++ language with well detailed examples.

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How to Iterate Over a Vector in Reverse Order in C++ - Step by Step Examples

How to Iterate Over a Vector in Reverse Order in C++ ?

Answer

✐ Examples

1 Iterate Over a Numeric Vector in Reverse Order

C++ Program

Output

2 Iterate Over a String Vector in Reverse Order

C++ Program

Output

Summary

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