Writing negative numbers in a racket

Question

2 - (-12 / x) = -4

negative 12 is what confuses me. where to put the negative sign?

(define (math x)
( = ( - ( / 12 x) 2) 4))

+3

scheme racket

Josh 22 jan. '13 at 3:21

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1 answer

Hunter mcmillen · Accepted Answer · 2013-01-22T03:27:41+0000

The negative character is part of the number itself, you write it just like you would in any other language:

(define (math x)
( = ( - ( / -12 x) 2) 4))

Output:

> (math 2)  ; 2-(-12/2) = -4 -> 2-(-6) = -4 -> 2 + 6 = -4 -> 8 = -4 (FALSE)
#f
> (math -2) ; 2-(-12/-2) = -4 -> 2-(6) = -4 -> -4 = -4 (TRUE)
#t