%10-21  narginĳʹ÷
%ʵ¹ܣùʱСڻһʱϵͳʾ룬ʱӣ3ʱǰӲȥ3¡
function d=nargintest(a,b,c)
if nargin<=1
    error('Not enough input arguments.')
elseif nargin==2
      d=a+b;
    elseif nargin==3
            d=a+b-c;
end
%⣬ʹnarginԲҺĸ磬ҪnargintestĲMATLAB 7.1
>> nargin('nargintest')
ans =
     3
>>
