How can I merge two arrays in C++?

How can I merge two arrays in C++?

You can merge two arrays in C++ by using a loop to copy elements from both arrays into a new array.

Can you show me a code example?

Sure! Here's a simple example:

#include <iostream>
using namespace std;

int main() {
    int arr1[] = {1, 2, 3};
    int arr2[] = {4, 5, 6};
    int merged[6];

    for (int i = 0; i < 3; i++) {
        merged[i] = arr1[i];
    }
    for (int i = 0; i < 3; i++) {
        merged[i + 3] = arr2[i];
    }

    for (int i = 0; i < 6; i++) {
        cout << merged[i] << " ";
    }
    return 0;
}

What if the arrays are of different sizes?

If the arrays are of different sizes, you can adjust the size of the merged array accordingly. Just ensure you loop through the correct number of elements from each array.

Is there a way to do this using the STL?

Yes! You can use the std::vector from the STL to merge arrays more easily. Here's an example:

#include <iostream>
#include <vector>
using namespace std;

int main() {
    vector<int> arr1 = {1, 2, 3};
    vector<int> arr2 = {4, 5, 6};
    vector<int> merged;

    merged.reserve(arr1.size() + arr2.size());
    merged.insert(merged.end(), arr1.begin(), arr1.end());
    merged.insert(merged.end(), arr2.begin(), arr2.end());

    for (int num : merged) {
        cout << num << " ";
    }
    return 0;
}