How to Concatenate Two Vectors in C Using `insert()`?

Concatenating Two Vectors

Combining two vectors is a common operation in C . Fortunately, the C Standard Library provides a straightforward way to concatenate two vectors using the insert() function.

How to Concatenate Two Vectors

To concatenate two vectors, you can use the following code:

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

This code appends the elements of vector2 to the end of vector1. The insert() function takes three parameters:

• The iterator pointing to the insertion point (in this case, vector1.end(), which points to the end of vector1)
• The iterator pointing to the beginning of the elements to insert (in this case, vector2.begin())
• The iterator pointing to the end of the elements to insert (in this case, vector2.end())

By passing these parameters to the insert() function, you effectively append the elements of vector2 to the end of vector1.

Example

Consider the following example:

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

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

std::cout << "Concatenated vector: ";
for (int i : vector1) {
  std::cout << i << " ";
}

Output:

Concatenated vector: 1 2 3 4 5 6

As you can see, the elements of vector2 have been successfully appended to the end of vector1.

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