how to append one vector to another c++

To append one vector to another in C++, you can use the insert function provided by the std::vector container class. Here are the steps to do this:

  1. Initialize two vectors, let's say vector1 and vector2, with the desired elements.

cpp std::vector<int> vector1 = {1, 2, 3}; std::vector<int> vector2 = {4, 5, 6};

  1. Use the insert function to append vector2 to vector1. The insert function takes three arguments: the position where you want to insert the elements, the beginning iterator of the range you want to insert, and the end iterator of the range you want to insert.

cpp vector1.insert(vector1.end(), vector2.begin(), vector2.end());

In this case, we want to insert vector2 at the end of vector1, so we use vector1.end() as the position to insert. We also pass vector2.begin() as the beginning iterator and vector2.end() as the end iterator to indicate the range of elements to be inserted.

  1. After the insertion, vector1 will now contain the elements from both vector1 and vector2.

cpp // Output: 1 2 3 4 5 6 for (int num : vector1) { std::cout << num << " "; }

The output will show all the elements in vector1, including the elements appended from vector2.

Note: This method uses the insert function to append one vector to another. Another approach is to use the push_back function to insert each element from vector2 into vector1 individually. However, using insert with iterators is more efficient when appending a large number of elements.