how to merge string array in C++

To merge string arrays in C++, you can use the std::copy() function along with the std::back_inserter() iterator. Here are the steps to do it:

1. First, include the necessary header file:

#include <algorithm>
#include <iterator>
#include <vector>
#include <string>

1. Declare and initialize the string arrays that you want to merge:

std::string arr1[] = {"Hello", "World"};
std::string arr2[] = {"How", "are", "you"};

1. Calculate the sizes of the arrays:

int size1 = sizeof(arr1) / sizeof(arr1[0]);
int size2 = sizeof(arr2) / sizeof(arr2[0]);

1. Create a new vector to hold the merged result:

std::vector<std::string> mergedArray;

1. Use the std::copy() function along with the std::back_inserter() iterator to merge the arrays:

std::copy(arr1, arr1 + size1, std::back_inserter(mergedArray));
std::copy(arr2, arr2 + size2, std::back_inserter(mergedArray));

1. Now, the mergedArray vector contains the merged result.

Here's the complete code example:

#include <algorithm>
#include <iterator>
#include <vector>
#include <string>

int main() {
  std::string arr1[] = {"Hello", "World"};
  std::string arr2[] = {"How", "are", "you"};

  int size1 = sizeof(arr1) / sizeof(arr1[0]);
  int size2 = sizeof(arr2) / sizeof(arr2[0]);

  std::vector<std::string> mergedArray;

  std::copy(arr1, arr1 + size1, std::back_inserter(mergedArray));
  std::copy(arr2, arr2 + size2, std::back_inserter(mergedArray));

  // mergedArray now contains the merged result
}

By using the std::copy() function and the std::back_inserter() iterator, you can easily merge string arrays in C++.