Sir, I want to read fffd to '-3' not '65533'

I think I need to use a typecast. but I don't know how to use it.. I find inverse answer about my question.

sprintf('%x', typecast(int16(-3),'uint16')) 
ans =
fffd

but I want to change fffd to -3 please help me sir..

Answer 1

[Image Analyst]

Try this:

theString = sprintf('%x', typecast(int16(-3),'uint16')) 
negNumber = double(hex2dec(theString)) - double(intmax('uint16')) - 1;
fprintf('%s is %d in signed 16 bit integer\n', theString, negNumber);