Big Integer handling in Blitz Basic 2D?

The answer is because if you've ever played "Trump: The Board game", it lowest dominator is 10 million, you can win potentially up to 1 billion +

In addition, in the game SWOS (Sensible World of Soccer) it used 1m 1.5m, 2.5k, etc (including a unit of measure) to aid usability and visual appeal, I wanted all of that -- but still wanted to do percentage cuts, and a multiplier of profits card (or multiple taxes card).

The way I resolved this problem was to do;

; This may be the wrong version, as I have different versions of the same code on my machine
; --------------------------------
Const	use_tender		= True
Const  	min_tender		= 10
Global 	cash_millions 	= 10
Global 	cash_billions 	= 1

Function add( millions=0, billions=0 )

	If (millions > 0) Then
		cash_millions = cash_millions + millions
	End If
	
	If (billions > 0) Then
		cash_billions = cash_billions + billions
	End If
	
	If cash_millions > 999 Then
		Repeat
			sum = (1000 - cash_millions)
			cash_millions = ( 0 ) + sum
			cash_billions = cash_billions + 1
		Until cash_millions < 1000
	End If
	
	If cash_billions > 10 Then cash_billions = 10
	
End Function

Function subtract( millions=0, billions=0 )

	If (millions > 0) Then
		If (cash_billions > 0) Then
			cash_millions = 1000
			cash_billions = cash_billions - min_tender
		End If

		If cash_millions > 0 Then
			cash_millions = cash_millions - millions	
		End If
	End If
	
	If (billions > 0) Then
		cash_billions = cash_billions - billions
	End If
	
	If cash_millions < 0 Then cash_milions  = 0
	If cash_billions < 0 Then cash_billions = 0	
End Function

add(0,0)


While Not KeyHit(1)
	Cls
	
		Text 100, 100 , cash_millions + "m"
		Text 100, 110 , cash_billions + "b"
				
		
		WaitKey()
		subtract(10)
		
	Flip
Wend

I did not try floats, but seeing as I just uninstalled BB2D, I'll have to reinstall it to find out if I can go to at least 10 billion.