Space Invaders

[lazur2006]

Hi everyone,
im writing a c code project called space invaders, but
ive got a problem with it.
I want to delete an enemy if it was hit.
I have no idea, how can i realize it, to overwrite the array position.
Here is my source code...

	while (1) {		//Bildschirm reset und Startposition
		system("cls");
		for (y = 1; y <= 20; y++) {
			for (x = 1; x <= 30; x++) {


				if (x == 1 || x == 30 || y == 1 || y == 20) {
					feld[y][x] = h_muster;
				}
				else if (feld[y][x] == 'O' && feld[y+2][x] == 'e') {
					//Feldwerte in Array schreiben
					
					feld[y][x] = '.';
					score++;
				}
				else if (feld[y][x] == '^') {
					feld[y][x] = 'e';
					feld[y-1][x] = '^';
				}
				else if (x == p_cursor_x && y == 18 && shot == 1) {
					//Drucke Schuss
					feld[y][x] = '^';
					shot = 0;
				}
				else if (x > 4 && x < 27 && y > scroll_down && y < (scroll_down + 6)) {
					//Drucke Gegner
					feld[y][x] = 'O';
					cycles++;
					if (cycles == 10000) {
						scroll_down++;
						cycles = 0;
					}
				}
				
				else if (x == p_cursor_x && y == 19) {
					//Drucke Spieler
					feld[y][x] = 'T';
				}
				else {
					feld[y][x] = '.';
				}




				printf("%c", feld[y][x]);
			}printf("\n");


		}
		printf("\n\nSCORE: %d", score);


		//Einlesen von Taste, falls Tasteneingabe nicht erfolgt -> Leerzeichen übergeben
		if (_kbhit()) {
			read_keyboard(_getch());
			fflush(stdin);
		}
		else {
			read_keyboard(' ');
		}




		//Warte 50ms, damit Bild nicht so oft neu geladen wird.
		Sleep(50);
	}

[algorism]

I don't understand why you can't just overwrite the array element. What's the problem?

system("cls") is a very inefficient mechanism to clear the screen. To clear the screen efficiently see the second option here: Clearing the console screen (Windows)

In fact, using the Windows console functions you could write directly to whatever position you want so you wouldn't need to clear the entire screen.

Although in your situation it probably doesn't matter that fflush(stdin) is "undefined behaviour" according to the C standard (as I believe it has some functionality in Windows), it does seem unnecessary to use it after a _getch call. I'm not even sure if it would work since _getch doesn't use stdin but reads from the keyboard buffer directly. If you really need to remove any extra keystrokes, then something like while(kbhit()) _getch(); would probably work.