Error using bitxor Inputs must be signed or unsigned integers of the same class or scalar doubles.

CODE:

info = dicominfo('brain_001.dcm');
t = dicomread(info);
figure(4)
imshow(t,[]);
title('ORIGINAL IMAGE')
p=randi([0 65536],256,256);
c=int16(p);
[a1,a2]=size(t);
for i=1:a1 %ENCRYPTION
    for j=1:a2
        x(i,j)=bitxor(t(i,j),c(i,j));

Error occurred:

Error using bitxor

Inputs must be signed or unsigned integers of the same class or scalar doubles.

Error in RDHEDIBSBDE (line 14)

x(i,j)=bitxor(t(i,j),c(i,j));

[Walter Roberson]

What is class(t)?

Warning: randi 0 65536 is a span of 65537 values. You then int16 the values but int16 can only store -32768 to +32767 and half of your values are above that.