C++ new line

In C++, there are several ways to insert a new line in a stream, such as std::cout or std::ofstream. Here are a few examples:

1. Using the \n escape sequence:

   std::cout << "Hello, world!\n";

   This will output "Hello, world!" followed by a new line.

2. Using the std::endl manipulator:

   std::cout << "Hello, world!" << std::endl;

   This will output "Hello, world!" followed by a new line, and also flush the buffer.

3. Using the std::endl manipulator with a variable:

   int x = 5;
   std::cout << "Hello, world!" << std::endl << x << std::endl;

   This will output "Hello, world!" followed by a new line, then the value of x followed by another new line.

4. Using the std::endl manipulator with a string:

   std::string str = "Hello, world!";
   std::cout << str << std::endl;

   This will output the contents of the string followed by a new line.

5. Using the std::endl manipulator with a formatted string:

   std::cout << std::fixed << std::setprecision(2) << 3.14 << std::endl;

   This will output the value of 3.14 with two decimal places followed by a new line.

Note that std::endl is a manipulator that inserts a new line and also flushes the buffer. If you want to insert a new line without flushing the buffer, you can use \n instead.