I am fairly sure that you cannot force the console to open in fullscreen mode when you run your prog. Check Duoas's article on issues in console programming; he has a list of windows console functions there. One of them may do the trick.
On Vista isn't possible, on XP call SetConsoleDisplayMode(GetStdHandle(STD_OUTPUT_HANDLE),CONSOLE_FULLSCREEN_MODE,0); ( you need to #include<windows.h> )