title: Can the C preprocessor perform simple string manipulation?
body: <p>This is <strong>C</strong> macro weirdness question. </p>
  
  <p>Is it possible to write a macro that takes string constant X ("...") as argument and evaluates to sting Y of same length such that each character of Y is [constant] arithmetic expression of corresponding character of X. </p>
  
  <p>This is not possible, right ?</p>