[racket] how must I interpreted this exercise

 From: Richard Cleis (rcleis at me.com) Date: Sat Jun 23 16:39:08 EDT 2012 Previous message: [racket] how must I interpreted this exercise Next message: [racket] how must I interpreted this exercise Messages sorted by: [date] [thread] [subject] [author]

You can print the result of the following, where the #t or #f is your value to be tested.

(string-append "It's" (if #t "" " not") " true.")
(string-append "It's" (if #f "" " not") " true.")

but I am not sure if that is what you are asking.

rac

On Jun 23, 2012, at 12:45 PM, Roelof Wobben wrote:

> I have another "problem" I try to solve in my head.
>
> Suppose I want to change one word in a sentence depening if a comparision is true or false.
>
> I could do this in pseudo code.
>
> if comparision is true then print "it's true" else  print "it's not true"
>
> It works but I type two time's "it's true".
>
> Can this be done so I have to type only one time the sentence and depeding on true or false the word not is used.
>
> Roelof
>
>
>
> Op 23-6-2012 16:18, Matthias Felleisen schreef:
>>
>> 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
>>>
>>>
>>>
>>> ____________________
>>>  Racket Users list:
>>>  http://lists.racket-lang.org/users
>>
>
>
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