MATLAB: How to clear this error

Question

Error: File: file.m Line: 103 Column: 1

Function definitions are not permitted in this context.

if true
103.function z =  myfunction(Ns,8)
104.c = Ns;
105.d= 8;
106.z =f(c, d)
107.end
108.function z = f(c,d)
109. if ~mod(c,d)
110. z=0
111. else
112. z=d-mod(c,d);
113. end
114. end

115. end

Answer 1

function z = myfunction(Ns)
c = Ns;
d= 8;
z =f(c, d) ;
end
function z = f(c,d)
if ~mod(c,d)
    z=0
else
    z=d-mod(c,d);
end
end

Save it.....it will be saved as myfunction.m. Call z = myfunction(3) ;