Learn Abstract and Concrete with Small Basic

I wrote some programs for learning abstract and concrete.  At first I made a subroutine Average().  This routine calculates (a + b) / 2.  The concept average is a special (concrete) case of a wider concept.  Secondly, I made a subroutine Intermediate().  The concept of this routine is wider and more abstract than Average().  Intermediate() needs one more parameter k.  And if k = 0.5, the result is the same as Average().  The output of this program is:

 Average(a=10, b=20) = 15
Intermediate(a=10, b=20, k=0) = 10
Intermediate(a=10, b=20, k=0.25) = 12.50
Intermediate(a=10, b=20, k=0.50) = 15.00
Intermediate(a=10, b=20, k=0.75) = 17.50
Intermediate(a=10, b=20, k=1.00) = 20.00

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The code is here.

' Abstract and Concrete

' Version 0.1

' Copyright © 2016 Nonki Takahashi. The MIT License.

' Program ID HRX565

 

TextWindow``.`` Title `` = ``"Abstract and Concrete 0.1"

 

' average value

a `` = ``10

b `` = ``20

Average``(``)

TextWindow``.``WriteLine``(`` "Average(a=" `` + `` a `` + `` ", b=" `` + `` b `` + `` ") = " `` + ``c``)

 

' intermediate value

For `` k `` = `` 0 `` To `` 1 `` Step ``0.25

  ``Intermediate``(``)

  ``TextWindow``.``WriteLine``(`` "Intermediate(a=" `` + `` a `` + `` ", b=" `` + `` b `` + `` ", k=" `` + `` k `` + `` ") = " `` + ``c``)

EndFor

TextWindow``.``WriteLine``(``""``)

 

Sub ``Average

  ``' param a - the first value

  ``' param b - the second value

  ``' return c - the average of the given values

  `` c `` = ``(`` a `` + ``b`` ) `` / ``2

EndSub

 

Sub ``Intermediate

  ``' param a - the first value

  ``' param b - the second value

  ``' param k - ratio between a and b (0 ≦ k ≦ 1)

  ``' return c - the intermediate value between a and b

  `` c `` = `` a `` * ``(`` 1 `` - ``k`` ) `` + `` b `` * ``k

EndSub

I sometimes use the code like Intermediate(). So I also wrote application samples of Intermediate() for points and colors. The program ID is HRX565-0.  This program is also text base.

One more sample is HRX565-1.  This is a graphical demo animation program for these concepts.

Screen shot of a program Abstract and Concrete 0.3