How to Convert an Array to a Vector in C++?

In C++, arrays are fixed-size data structures that store elements of the same type. On the other hand, vectors are dynamic arrays that can grow and shrink in size as needed. In this article, we will learn how to convert an array to a vector in C++.

Example:

Input: 
myArray = {10,20,30,40,50,60}

Output: 
myVector = {10,20,30,40,50,60}

Converting an Array to a Vector in C++

For converting the elements stored in an array to a std::vector in C++, we can use the range constructor of std::vector that takes two iterators, one to the beginning and one to the end of the array.

Syntax to Convert Array to a Vector in C++

vector<type> vectorName(arrayName, arrayName + arraySize);

Here,

• type is the data type of the elements in the array and the vector.
• vectorName is the name of the vector.
• arrayName is the name of the array we want to convert to a vector.
• arraySize is the number of elements in the array.

C++ Program to Convert an Array to a Vector

The below program demonstrates how we can convert an array to a vector in C++.

C++

// C++ program to illustrate how to convert an array to a
// vector
#include <iostream>
#include <vector>
using namespace std;

int main()
{
    // Array
    int arr[] = { 10, 20, 30, 40, 50, 60 };
    int n = sizeof(arr) / sizeof(arr[0]);

    // Print the array
    cout << "Array: ";
    for (int i = 0; i < n; i++)
        cout << arr[i] << " ";
    cout << endl;

    // Convert array to vector
    vector<int> vec(arr, arr + n);

    // Print the vector
    cout << "Vector: ";
    for (int i = 0; i < vec.size(); i++)
        cout << vec[i] << " ";
    cout << endl;

    return 0;
}

Output

Array: 10 20 30 40 50 60 
Vector: 10 20 30 40 50 60 

Time Complexity: O(N), where n is the number of elements in the array.
Auxiliary Space: O(N)