How to Join Arrays in C++ - Step by Step Examples

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How to Join Arrays in C++ ?

Answer

To join arrays in C++, you can use the std::copy or std::vector classes.

✐ Examples

1 Joining Arrays using std::copy

In this example,

We create two arrays, arr1 and arr2.
We then use the std::copy function from the header to copy elements of arr2 to the end of arr1.
The result is a new array result containing elements from both arr1 and arr2.

C++ Program

#include <iostream>
#include <algorithm>
int main() {
    int arr1[] = {1, 2, 3};
    int arr2[] = {4, 5, 6};
    int size1 = sizeof(arr1) / sizeof(arr1[0]);
    int size2 = sizeof(arr2) / sizeof(arr2[0]);
    int result[size1 + size2];
    std::copy(arr1, arr1 + size1, result);
    std::copy(arr2, arr2 + size2, result + size1);
    for (int i = 0; i < size1 + size2; i++) {
        std::cout << result[i] << " ";
    }
    return 0;
}

Output

1 2 3 4 5 6

2 Joining Arrays using std::vector

In this example,

We create two std::vector objects, vec1 and vec2.
We then use the insert method of vec1 to insert elements of vec2 at the end of vec1.
The result is a new vec1 containing elements from both vec1 and vec2.

C++ Program

#include <iostream>
#include <vector>
int main() {
    std::vector<int> vec1 = {1, 2, 3};
    std::vector<int> vec2 = {4, 5, 6};
    vec1.insert(vec1.end(), vec2.begin(), vec2.end());
    for (int num : vec1) {
        std::cout << num << " ";
    }
    return 0;
}

Output

1 2 3 4 5 6

Summary

In this tutorial, we learned How to Join Arrays in C++ language with well detailed examples.

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