MATLAB: Problem with a function.

function

I am trying to insert a function into my program but every time it tells me "error in perimeter line 3, p=4*s". Here is part of my program as well as my function. Can someone tell me what I am doing wrong? Thanks
function p=perimeter(s);
p=4*s;
end
into this part of my program:
h=input('What shape do you want?:','s');
if strcmp(h, 'square')
    s=input('The length of a side is (m):');
    A=s^2;
    p=perimeter;
    fprintf('The area of the Square is %.2f meters^2 \n',A)
    fprintf('and the perimeter is %.2f meters\n',p)

Best Answer

You need to pass s into your perimeter function:
p = perimeter(s);
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