The Racket language is a modern dialect of Lisp and a descendant of the Scheme. It is designed as a platform for programming language design and implementation.
Basic racket programs of SICP course
- Factorial Recursive.rkt
#lang racket
(define (factorial n)
(if (= n 1)
1
(* n (factorial (- n 1)))))
- Factorial Iterative.rkt
#lang racket
(define (fact-iter product counter max-count)
(if (> counter max-count)
product
(fact-iter (* counter product)
(+ counter 1)
max-count)
)
)
(define (factorial n)
(fact-iter 1 1 n))
- Fibonacci Tree Recursive.rkt
#lang racket
(define (fib n)
(cond ( (= n 0) 0)
( (= n 1) 1)
(else ( + (fib (- n 1))
(fib (- n 2))
)
)
)
)
- Fibonacci Iterative.rkt
#lang racket
(define (fib-iter a b count)
(if (= count 0)
b
(fib-iter (+ a b) a (- count 1))))
(define (fib n)
(fib-iter 1 0 n))
- Exponential Recursive.rkt
#lang racket
(define (expt b n)
(if (= n 0)
1
(* b (expt b (- n 1)))))
- Exponential Iterative.rkt
#lang racket
(define (expt-iter b counter product)
(if (= counter 0)
product
(expt-iter b
(- counter 1)
(* b product))))
(define (expt b n)
(expt-iter b n 1))
- Fast Exponential.rkt
#lang racket
(define (even? n) (= (remainder n 2) 0))
(define (square n) (* n n))
(define (fast-expt b n)
(cond ((= n 0) 1)
((even? n) (square (fast-expt b (/ n 2))))
(else (* b (fast-expt b (- n 1))))))
- GCD Recursive.rkt
#lang racket
(define (gcd a b)
(if (= b 0)
a
(gcd b (remainder a b))))
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