understanding the use of system("cls")

[shekhartanwar]

hi...can anyone tell me what is the use of the function ,system("cls"), and fflush()? and when they are used?

[kbw]

First, don't use system().

system() runs a command thru the currently configured shell. In Windows, that means cmd.exe. So if you want to see what the command does, run cmd.exe then type cls. It's the DOS/Windows command for clearing the screen (it came from BASIC).

fflush() flushes a file's buffer to disk. When you work with files (using FILE*), you're dealing with a buffered file. It's buffered to improve performance. But sometimes you want to update the physical file with what's been buffered, it's called flushing the buffer. fflush does that.

[Duthomhas]

If you are getting information about these from the same place, then they are both probably wrong.

Using system() is a dangerous security hole with lots of caveats to proper use. Use wisely.
http://linux.die.net/man/3/system
http://www.cplusplus.com/forum/articles/11153/

Use fflush() only on output streams. It is not defined to work on input streams.
http://linux.die.net/man/3/fflush
http://www.daniweb.com/software-development/cpp/threads/90228

Good luck!