In the first question, "else..." should be inside []. On Wed, Jun 1, 2011 at 3:24 PM, Yingjian Ma <yingjian.ma1...@gmail.com>wrote:
> 1 I wrote the following code > > (define (test x) > (add1 x) > (define (tst x) > (cond > [(= x 1) (add1 x)] > else > (+ x 2)))) > > and got error msg as > > begin (possibly implicit): no expression after a sequence of internal > definitions in: ((add1 x) (define (tst x) (cond ((= x 1) (add1 x)) else (+ x > 2)))) > > What is wrong? > > The next two questions were posted a few minutes ago but I was not sure if > they reached the website. I am putting them here > > 2 I wrote > > (define (p x) > (+ x 10) > (* x 10) > ) > > The result of (p 4) is 40. How can I display 14 and 40? > > 3 How can I compare two letters in Ascii order? For example, when input > are "x" and "y", the program will tell x is before y. > > Thanks a lot. >
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