Difference between 'endl' and '\n' in cpp?

'endl' and '\n' are used to signify a newline character. However, there are some differences between the two.

'endl' is a manipulator that is used to insert a newline character into the output stream, just like '\n'. However, 'endl' does more than just insert a newline character it's also flushes the output buffer. Flushing the output buffer means that any data that has been buffered for output is immediately written to the output device. This can be useful in some situations where you want to make sure that all the output has been written to the device before continuing with the program.

On the other hand, '\n' simply inserts a newline character into the output stream, without flushing the output buffer. This means that any data that has been buffered for output may not be immediately written to the output device.

In terms of usage, you can use 'endl' or '\n' to insert a newline character in your output. However, if you are printing a lot of data, using 'endl' can be less efficient than using '\n'. This is because flushing the output buffer can be an expensive operation, especially if you are outputting a large amount of data. In general, it's best to use 'endl' when you specifically need to flush the output buffer, and use '\n' for most other cases.