```
ffunction HCF = mini (x, y)
%This function searches for highest common factor
%It first checks if any of the numbers equal to zero, if so the non zero number is the HCF
%If the numbers are different, you minus the bigger number by the smaller one and this is done by recursion.
if x==0
HCF = y;
elseif y==0
HCF == x;
elseif (y == x)
HCF = x;
elseif (y>x)
HCF = mini(y-x,x);
else
HCF = mini(x-y,y);
end
```