Need some very nooby help.

[Lonners]

Part of a source file I have is

int move_arrow(int x_arrow, int y_arrow, int COLOUR)
{
	int XF=XOFF,YF=YOFF;
	int key_pressed,new_y_arrow,line;

	key_pressed=getch();
	key_pressed=getch(); 

	new_y_arrow = y_arrow;
	while (key_pressed==KEY_DOWN||KEY_UP||KEY_LEFT||KEY_RIGHT||RETURN) // replot arrow unless RETURN pressed
	{
		draw_arrow(x_arrow, new_y_arrow, BLACK);

		/* move arrow if arrow keys pressed */
		if (((key_pressed==KEY_DOWN) || (key_pressed==KEY_RIGHT)) && (new_y_arrow <= y_arrow+10*(NUM_HOLES-2)))
		{
			new_y_arrow=new_y_arrow+10;
			line=new_y_arrow;
		}
		else if (((key_pressed==KEY_UP) || (key_pressed==KEY_LEFT)) && (new_y_arrow >= y_arrow+10))
		{
			new_y_arrow=new_y_arrow-10;
			line=new_y_arrow;
		}
		else if (key_pressed==RETURN)
		{
			new_y_arrow=new_y_arrow;
			line=new_y_arrow;
			break;
		}

		draw_arrow(x_arrow, new_y_arrow, COLOUR);

		/* read keyboard again */
		key_pressed=getch();
		key_pressed=getch();

	} /* end of while loop */

	return line;
	
}

Does this function return a value for "line"? and how do I use this value in another function?

[Elysia]

Yes, it does, but it also returns junk data if the loop conditions are never met, so initialize the variable.

To take the return value of a function, you simply do:

int foo() { return 7; }
int main()
{
	int n = foo();
	// n contains the return value from foo
	return 0;
}

[Dino]

A couple points...

Part of a source file I have is

int move_arrow(int x_arrow, int y_arrow, int COLOUR)
{
        ....
	return line;
	
}

Does this function return a value for "line"? and how do I use this value in another function?

It does return a line, but the function declaration says it returns an int.

Also, line must be a global variable since it is not declared. Since it is a global, I'm not sure why you need to return it.

Todd

[Adak]

Line is a local variable, Todd.

I don't understand why Lonners doesn't just try to print the returned value from the calling function, and THEN he'd know without wasting all this time.

How long does it take to write one print line of code?

[Dino]

Line is a local variable, Todd.

Yes, you are correct - I now see it crammed onto the end of the other declarations. My bad.

[Salem]

> while (key_pressed==KEY_DOWN||KEY_UP||KEY_LEFT||KEY_RIGH T||RETURN)
You had the correct syntax for comparing with several keys later on.