[racket] how must I interpreted this exercise

Origin means (0,0) or plain 0 in English. 


On Jun 22, 2012, at 2:42 PM, Roelof Wobben wrote:

> Hello, 
> 
> I try to make this exercise : 
> 
> Exercise 76: A programmer has chosen to represent locations as Cartesian points or just points:
> ; Location is one of:
> ; – Posn
> ; – Number
> ; interp. Posn are positions on the Cartesian grid,
> ; Numbers are positions on the number line
> Design the function in-reach, which determines whether or not a given location’s distance to the origin is strictly less than some constantR.
> 
> So I must design a function called in-reach.
> 
> Am I right I need to use two structs (Posn) . One for the given location and one for the origon ?
> 
> Regards, 
> 
> Roelof
> 
> 
> 
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