How to resolve the algorithm Function prototype step by step in the J programming language

Published on 12 May 2024 09:40 PM
#J

How to resolve the algorithm Function prototype step by step in the J programming language

Table of Contents

Problem Statement

Some languages provide the facility to declare functions and subroutines through the use of function prototyping.

Demonstrate the methods available for declaring prototypes within the language. The provided solutions should include:

Languages that do not provide function prototyping facilities should be omitted from this task.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Function prototype step by step in the J programming language

Source code in the j programming language

   NB. j assumes an unknown name f is a verb of infinite rank
   NB. f has infinite ranks
   f b. 0
_ _ _
   
   NB. The verb g makes a table.
   g=: f/~

   NB. * has rank 0
   f=: *


   NB. indeed, make a multiplication table
   f/~ i.5
0 0 0  0  0
0 1 2  3  4
0 2 4  6  8
0 3 6  9 12
0 4 8 12 16
   
   NB. g was defined as if f had infinite rank.
   g i.5
0 1 4 9 16
   
   NB. f is known to have rank 0.
   g=: f/~

   NB. Now we reproduce the table
   g i.5
0 0 0  0  0
0 1 2  3  4
0 2 4  6  8
0 3 6  9 12
0 4 8 12 16
   
   

   NB. change f to another rank 0 verb
   f=: +   

   NB. and construct an addition table
   g i.5
0 1 2 3 4
1 2 3 4 5
2 3 4 5 6
3 4 5 6 7
4 5 6 7 8
   

   NB. f is multiplication at infinite rank
   f=: *"_
   

   NB. g, however, has rank 0
   g i.5
0 0 0  0  0
0 1 2  3  4
0 2 4  6  8
0 3 6  9 12
0 4 8 12 16

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