»Dr. Scheme«

4. About six million people living near the Congo River speak a Bantu language called Lingala. Their words for
numbers 1 through 9 are:
1 moko, 2 mibale, 3 misato, 4 minei, 5 mitano, 6 motoba, 7 nsambo, 8 mwambe, 9 libwa
The word for 10 is zomi, but the prose numerals for multiples of 10 from 20 to 90 are formed from an alternative word
for 10, ntuku, and the word for the multiplier:
10 zomi, 20 ntuku mibale, 30 ntuku misato, etc.
The prose numerals for multiples of 100 up to 900 are formed from the word nkama ( hundred') and the word for the
multiplier:
100 nkama moko, 200 nkama mibale, 300 nkama misato, etc.
Similarly, the prose numerals for multiples of 1000 up to 9000 are formed from the word nkoto ( thousand') and the
word for the multiplier:
1000 nkoto moko, 2000 nkoto mibale, 3000 nkoto misato, etc.
Linking these words together forms the numbers 1 through 9999:
11 zomi moko
21 ntuku mibale moko
84 ntuku mwambe minei
157 nkama moko ntuku mitano nsambo
440 nkama minei ntuku minei
913 nkama libwa zomi misato
1111 nkoto moko nkama moko zomi moko
2001 nkoto mibale moko
5082 nkoto mitano ntuku mwambe mibale
9999 nkoto libwa nkama libwa ntuku libwa libwa
Develop the Scheme function Lingala, which consumes an integer between 1 and 9999 and produces the Lingala
prose for that number.

;; Number 4
(define (ones x)
(modulo x 10))
(define (tens x)
(modulo (quotient x 10) 10))
(define (hundreds x)
(modulo (quotient (quotient x 10) 10) 10))
(define (thousands x)
(modulo (quotient (quotient (quotient x 10) 10) 10) 10))

;; Lingala: number -> string
;; consumes a number and returns the Lingala number
;;
(define (Lingala-number x)
(cond
[(= (ones x) 1) "moko"]
[(= (ones x) 2) "mibale"]
[(= (ones x) 3) "misato"]
[(= (ones x) 4) "minei"]
[(= (ones x) 5) "mitano"]
[(= (ones x) 6) "motoba"]
[(= (ones x) 7) "nsambo"]
[(= (ones x) 8) "mwambe"]
[(= (ones x) 9) "libwa"])

Do you know how to write Scheme?

I think Dr. Scheme is modified version of Scheme, because I'm in Computer Science 1A class, which is the very basics of computer science.

I think after this semester we're going to start learning Java...Dr. Scheme is supposed to be like a prep I guess...

I think after this semester we're going to start learning Java...Dr. Scheme is supposed to be like a prep I guess...

I am curious what criteria they had in mind when they came up with bantu keywords as in Scheme.

If you need more help don't hesitate to ask

The language of Scheme is very English-like as well, if you take a look. Such as "define," "substring," "string-append," "number->string," "quotient," etc...

As is every programming language. WIth one difference: Other languages are USEFUL.

Just because YOU don't know how to use it doesn't mean it's not useful ...don't try and cover up your ignorance with scorn.

I don't know Fortran or VB either, but they are USEFUL.

Don't judge something when you don't understand it yet.

And they say that it is useful in programming applications in robotics.