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`Hopefully this will help! Lots of love, BFM.

`An example of hex colour code, 0x(Alpha-00)(Red-00)(Green-00)(Blue-00) I prefer hex code rather than the RGB command. 
`If you play with it long enough, you'll start to understand it. 

#Constant White 0xFFFFFFFF
#Constant Black 0XFF000000

`Some simple setups so that the text displays correctly. 
Backdrop On
Color Backdrop White
Ink Black

`Main program loop
Do
	Set Cursor 0,0
`Note how, regardless of the return value, even though the function follows the "IF" statement, it is still executed. 
	If getkey(Scancode())
		Print "Explosions! This is because the function is returning a value ^_^"
	Endif
Loop
End

`Now for the functions, always write functions after the main game loop, after END. 

Function getkey(key_pressed)
	Print "Scancode detected " ; key_pressed ; " ... Yay!" 
`Next, if a key is pressed, the example return triggers
	If key_pressed > 0
		example_return = 1
	Endif
`Note how the example_return automagically returns to 0
Endfunction example_return

void getKey() {
    if(inkey() == '1')
        return 1;
    if(inkey() == '2')
        return 2;
    // Notice how (1) the function is declared to not return anything and (2) there is no value returned if inkey() is neither 1 nor 2.
}