ECE question...MATLAB...function that performs half-adder and full-adder?

Question

Write a MATLAB function the performs the operation of a half-adder, call it half_add.  The 
  function should have two inputs, a and b, and return two outputs, X and c.  Then, write another 
  function, call it full_add, that invokes half_add to perform the operation of a full adder.  The 
  function full_add should have three inputs, a, b and c_in, and return two outputs, s and c_out.  
  Finally, write a program that uses the function full_add to find and display s and c_out for each 
  possible combination of a, b, and c_in. 


This is what I have so far for the half-adder:

clear all; clc
function  [(X,c)]  = half_add( (a,b) )
%function to perform the operation of a half-adder
% a and can be logical or numeric binary vectors
a = logical([0 0 1 1]); b = logical([0 1 0 1]); % assigning a and b
for k = 1:4
    X(k) = xor(a,b)
    c(k) = a(k) & b(k)
end

end


please explain me what to do after this...

Thank you

Anonymous · Accepted Answer

What you're doing doesn't work.

In general, a function has input/output parameters.

Input parameters come from the outside of the function.
Output parameters are calculated within that function.

Start your function like this:

function [X, c] = half_add(a, b) 
... code
... code
... do whatever


Call that function from another script or from your main code, or even from your command window.
You define parameters somehow there and then you call the function. For example,

a = [0 0 1 1]; 
b = [0 1 0 1];
[X, c] = half_add(a, b) 

You get your answers in X and in c.

.

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ECE question...MATLAB...function that performs half-adder and full-adder?

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