HP Prime: Programme Check Sums

[Gerald H]

Displaying my ignorance yet again, I can't find how to see the check sum of an entered programme.

Could a Prime adept please assist & advise where to find this info?

[DrD]

One way is to sum all of the (ascii values) of the characters in a file, modulo 256. The result is a simple checksum.

You can test the checksum by checking Cksm("Cksm"): which should return a checksum of 249
<or>
Cksm("<your filename here>") which should return a checksum between 0 and 255

If you don't mind a two-step yankee innovation:

Code:


//===============================================
//                 Cksm                         =
//                                              =
//  Simple   File Checksum Generator            =
//  Input:   Filename as quoted string          =
//  Outputs: Sum of all ascii chars modulo 256  =
//                                              =
//===============================================
EXPORT Cksm(fn)
BEGIN 
  L1:=concat({},Programs(fn));
  return ΣLIST(asc(L1(1))) mod 256; 
END;

-Dale-