string in C++

In C++, string is an object of std::string class that represents sequence of characters. We can perform many operations on strings such as concatenation, comparison, conversion etc.
A simple example of C++ string.
```
#include <iostream>
using namespace std;
int main ()
{
  string s1 = "Hello";
  char ch[] = { 'C', '+', '+' };
  string s2 = string (ch);
  cout << s1 << endl;
  cout << s2 << endl;
}
```
Output:
```
Hello
C++
```