system("cls");

[jannusuraj]

what does system("cls"); do?

[johny10151981]

to clear the screen. run cls on your command window you will seee

[weaknessforcats]

Totally non-standard. Uses <conio.h>. I would avoid this.

[johny10151981]

agree with ............... .....

[Luuk]

It send the command "cls" to the system.
Some systems might know what to do with it,
and some will, as stated earlier, clear the screen.

But if you are on windows, and write a batch-file named "cls.bat" it will do different things based on the contents of that batch-file.....