Firstly, if-else condition statements are not loops.
Secondly you need to use either "&" or "|" depending upon the how you want to compare. Use "&" if you want to all conditions to be satisfied, otherwise, use "|" if you want only one of the conditions to be satisfied.
Also, you need to specify each conditional relation separately, for e.g. (a>0 &a<10) is the valid syntax.
PAs = 9;
DAs = 8;
As = 131;
Bs = 3;
%I have used & here
if (PAs==0) & (DAs==0) & (As==0) & (Bs==0)
disp('specimen is sound');
elseif (0<PAs) & (PAs<10) & (0<DAs) & (DAs<10) & (As<100) & (Bs<2);
disp('cap undercut');
elseif (0<PAs) & (PAs<10) & (0<DAs) & (DAs<10) & (As>100) & (Bs>2);
%There was a typo here^
disp('toe crack');
else disp('not identified');
end
