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Create a vector and initialize it from another vector in C++ STL

C++ STL | vector creation and initialization from another vector: Here, we are going to learn how to create a vector and initialize it from another vector C++ STL?
Submitted by IncludeHelp, on May 12, 2019

What is the vector?

Vector is a container in C++ STL, it is used to represent array and its size can be changed.

Read more: C++ STL Vector

Create a vector and initializing it from another vector

We can also initialize a vector from a given vector in C++ STL. Here, we are going to learn the same, how can we initialize a vector from a given vector?

Here is the syntax to create and initialize and initialize vector from another vector,

vector<type> vector_name(another_vector.begin(), another_vector.end());

Here,

• type – is the datatype.
• vector_name – is any use defined name to the vector.
• another_vector.begin(), another_vector.end() – another vector's begin() and end() functions.

Example to create/declare and initialize vector from another vector

vector<int> v2(v1.begin(), v1.end());

C++ STL program to create and initialize a vector from another vector

//C++ STL program to create and initialize 
//a vector from another vector
#include <iostream>
#include <vector>
using namespace std;

int main()
{

    //vector declaration and initialization
    vector<int> v1{ 10, 20, 30, 40, 50 };

    //vector declaration and initialization
    //from given vector v1
    vector<int> v2(v1.begin(), v1.end());

    //printing the vector elements
    //using for each kind of loop
    cout << "Vector v2 elements are: ";
    for (int element : v2)
        cout << element << " ";
    cout << endl;

    return 0;
}

Output

Vector v2 elements are: 10 20 30 40 50