A simple demostration of how to clear the console screen in at least Dev-C++ 4.9.8.0 (I don't know about the other since I've only tried it on this one, but may and probably works,, with few if at all minor adjustments), what more can I say, other than it's not the best way to do it but may be useful.

#include <iostream>//needs these three lines
#include <stdlib.h>//needs these three lines
using namespace std;//needs these three lines

int main(int argc, char *argv[])
{
  cout << "A simple Demonstartion of system(\"cls\");" << endl;
  system("PAUSE");	
  system("cls");//clears the screen
  cout << "The first two lines are gone" << endl;
  system("PAUSE");	
  return 0;
}

i modified it a little bit for c and it works , i learned one thing today , thanx

Sorry about that, but that's the only thing I could find on how to clear the screen, and so far I could get to work only on Dev-C++

the code should be ANSI standard code to work on all compilers, and i DONT see any un-ANSI code! it should work on others, i have compiled DevC++ projects on MSVC++ Before without any problems

system ("cls") and other system commands are handy to get a list of all possible system lines that i know of just go Start>run>cmd>help, it gives a list of all commands that you could use some usefull ones are color ie.
system("color A")
would change the text on the console to bright green (hello matrix)