Hex to string and vice versa

[janusz.prusaczyk@xxxxxx]

Sorry if I ask easy questions, I am only starting to learn:

I want to read a string from file, the string can contain only these
characters: "0123456789ABCDEF". I want to treat this string as hex number,
add to it another hex number and write this number as string to file (I want
to read this later in CL program as string value).

Can anybody post some example code as how to convert such string to hex, add
two hex values and write string to file representing the result?

Thank you for your patience,

David

***************************
  Janusz David Prusaczyk
  janusz.prusaczyk@big.pl
  tel. +48 (22) 657 57 48
***************************
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