creating area of a circle function in matlab

main.m
function A = circleArea(radius)
% CIRCLEAREA calculates the area of a circle with given radius.
% Syntax: A = circleArea(radius)
% Input:
%   radius: radius of the circle.
% Output:
%   A: area of the circle.
%
% Example:
% >> radius = 5;
% >> area = circleArea(radius)
%
% Author: John Doe (johndoe@example.com)
% Date: 01-Jan-2022

% Check the input
if ~isnumeric(radius) || numel(radius)~=1 || radius<=0
    error('Invalid input. The radius must be a positive scalar.')
end

% Calculate the area
A = pi*radius^2;

end
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main.m
% Call the function
radius = 5;
area = circleArea(radius);
disp(['The area of a circle with radius ', num2str(radius), ' is ', num2str(area)])
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main.m
The area of a circle with radius 5 is 78.5398
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