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Questions - racket

Rewriting a common function using tail-end recursion

I've been trying to tinker with this code to rewrite a "repeat" function using tail-end recursion but have gotten a bit stuck in my attempts. (define (repeat n x) (if (= n 0) '() ...
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Schultzie67

recursion

lisp

racket

tail-recursion

Votes: 0

Answers: 1

Latest Answer

Your repeat-tco function is indeed tail recursive: it is so because the recursive call to rec is in 'tail position': at the point where it's called, the function that is calling it has nothing left to...
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ignis volens

How do you write a declaration in racket that returns either a string or #f (false)?

I have the following function in racket: ( : search-stack : Symbol KeyStack -> String) (define (search-stack s stack) This function searches the stack for a specific string and returns the matching...
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Max

types

racket

declaration

Votes: 0

Answers: 1

Latest Answer

Consider the simpler function match, which just checks a pair (which could be one element of a stack). With signature (informal type as a comment) this could be: #lang racket (define (match s p) ;; S...
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mnemenaut

What is the difference between of code written in DrRacket in "R5RS" vs "#lang racket"?

Is there a difference between in syntax of coding or code will same in both language types? I wrote a program in #lang racket language but I was supposed to do it in the "R5RS" type.
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VIPER

scheme

racket

r5rs

Votes: 0

Answers: 2

Latest Answer

The short answer is that it depends on the program. #lang racket and #lang r5rs share the same basic syntax but smaller things may change between the two, e.g. [ can be used in place of ( in racket bu...
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edoput

Drracket: Finding highest value in a list without in built function

This assignment for a class I'm in has me pretty confused. I was able to get most of the function working but this one part is what's keeping me from completing it. I have two functions which is what ...
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Dima

list

arguments

racket

Votes: 0

Answers: 2

Latest Answer

(define (largest-num lst (acc -inf.0)) (cond ((empty? lst) acc) ((and acc (> (car lst) acc)) (largest-num (cdr lst) (car lst))) (else (largest-num (cdr lst) acc))))
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Gwang-Jin Kim

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