#     
## Overview
A **string** in C++ is used to store text. A ``string`` variable contains a collection of characters that are enclosed by double quotes ``" "``.

The process of adding strings together is referred to as **string concatenation.**

To create a ``string`` variable, let's look at the code below.

## Code

#include <iostream>
// including the string library
#include <string>
using namespace std;

int main() {
  // creating the string
  string name = "Onyejiaku Theophilus";
  cout << name;
  return 0;
}

## Explanation
Here we create the string variable called ``name`` and we print it.

## String concatenation
Like mentioned earlier, the term string concatenation is a process of adding ``string`` variables together.  We simply use the ``+`` operator to add strings together.

## Code

#include <iostream>
#include <string>
using namespace std;
 
int main () {
  // creating a string
  string firstName = "Theophilus ";

  // creating another string
  string lastName = "Onyejiaku";

  //concatenating the strings
  string fullName = firstName + lastName;
  cout << fullName;
  return 0;
}

## Explanation
* In line 7 & 10, we create two string variables `firstName` and `lastName` and we concatenate the two strings using the `+` operator in line 13. 
* We also assign the output to another variable `fullName` in line 13 which we then  print in line 14. 

## Using the append() function
The **`append()`** function is also used to add strings together
The syntax is given as:
```
string.append(string)
```
## Parameter
The `append()` function takes a ``string`` variable as its parameter value. 

## Return value
The `append()` function returns a concatenated strings.
## Code


#include <iostream>
#include <string>
using namespace std;
 
int main () {
  // creating a string variable
  string firstName = "Theophilus ";

  // creating another string variable
  string lastName = "Onyejiaku";

  // using the append() function to add the two strings
  string fullName = firstName.append(lastName);

  cout << fullName;
  return 0;
}

* In line 7 & 10, we create two string variables `firstName` and `lastName` and we concatenate the two strings using the `append()` function in line 13. 
* We also assign the output to another variable `fullName` in line 13 which we then  print in line 14. 

How to concatenate strings using the append function in C++

String concatenation in C++ can be done using the + operator or the append() function, which joins strings and stores the result.