How to Insert an Element at Specific Index in a List in C++ - Step by Step Examples

How to Insert an Element at Specific Index in a List in C++ ?

Answer

To insert an element at a specific index in a list in C++ using std::list, you can use the std::advance and std::insert functions.

✐ Examples

1 Insert Element at Specific Index Using advance and insert

In this example,

We include the necessary headers: and .
We create a std::list named numbers with initial integer values.
We define the desired index and the new element.
We use the std::advance function to move the iterator to the desired index.
We use the std::insert function to insert the new element at the iterator position.
Finally, we print the updated list to standard output.

C++ Program

#include <iostream>
#include <list>

int main() {
    std::list<int> numbers = {1, 2, 3, 4, 5};
    int index = 2;
    int element = 10;
    auto it = numbers.begin();
    std::advance(it, index);
    numbers.insert(it, element);
    for (int num : numbers) {
        std::cout << num << " ";
    }
    return 0;
}

Output

1 2 10 3 4 5

2 Insert Element at Beginning of List

In this example,

We include the necessary headers: and .
We create a std::list named numbers with initial integer values.
We use the std::insert function to insert a new element at the beginning of the list.
Finally, we print the updated list to standard output.

C++ Program

#include <iostream>
#include <list>

int main() {
    std::list<int> numbers = {1, 2, 3, 4, 5};
    int element = 10;
    numbers.insert(numbers.begin(), element);
    for (int num : numbers) {
        std::cout << num << " ";
    }
    return 0;
}

Output

10 1 2 3 4 5

Summary

In this tutorial, we learned How to Insert an Element at Specific Index in a List in C++ language with well detailed examples.

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How to Insert an Element at Specific Index in a List in C++ - Step by Step Examples

How to Insert an Element at Specific Index in a List in C++ ?

Answer

✐ Examples

1 Insert Element at Specific Index Using advance and insert

C++ Program

Output

2 Insert Element at Beginning of List

C++ Program

Output

Summary

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