function r = chkevod(val,chk)

% this function checks if a given number is even or odd.

% the command rem is an inbuilt matlab command that accepts two arguments and divides the 1st argument by the second
% and its output is the remainder after the division. here the argument chk has value 2, therefore when a number is 
% divided by 2, the remainder will be 0 or 1 if the number is even or odd respectively.

r = rem(val,chk)

% function ends, returns r.