Interfaces in Scilab

In Scilab, we don’t have interfaces as a language feature, but we can simulate similar behavior using structures and functions. Let’s implement a similar concept for geometric shapes.

// Define our geometric shapes as structures
function r = rect(width, height)
    r = struct('width', width, 'height', height);
endfunction

function c = circle(radius)
    c = struct('radius', radius);
endfunction

// Implement area and perimeter functions for rect
function a = rect_area(r)
    a = r.width * r.height;
endfunction

function p = rect_perim(r)
    p = 2 * r.width + 2 * r.height;
endfunction

// Implement area and perimeter functions for circle
function a = circle_area(c)
    a = %pi * c.radius^2;
endfunction

function p = circle_perim(c)
    p = 2 * %pi * c.radius;
endfunction

// A generic measure function
function measure(shape)
    disp(shape);
    if typeof(shape) == "st" then
        if isfield(shape, 'width') then
            disp(rect_area(shape));
            disp(rect_perim(shape));
        elseif isfield(shape, 'radius') then
            disp(circle_area(shape));
            disp(circle_perim(shape));
        end
    end
endfunction

// Main execution
r = rect(3, 4);
c = circle(5);

measure(r);
measure(c);

In this Scilab code:

We define rect and circle as structures, which are similar to the structs in the original code.
We implement separate functions for area and perimeter calculations for each shape, as Scilab doesn’t support methods attached to structures.
The measure function takes a shape as an argument and calls the appropriate area and perimeter functions based on the shape’s fields.
In the main execution part, we create a rectangle and a circle, then call the measure function for each.

To run this program, save it as geometry.sce and execute it in Scilab:

--> exec('geometry.sce', -1)
  width: 3
  height: 4

  12.
  14.

  radius: 5

  78.539816
  31.415927

This example demonstrates how to simulate interface-like behavior in Scilab using structures and functions. While it’s not as elegant as Go’s interfaces, it achieves a similar purpose of providing a common set of operations for different types of shapes.

Methods in Scilab

Enums in Scilab

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Interfaces in Scilab