Extracting Characters

[DrHippyHomer]

Help!!!

char FormatID(unsigned char *pString, unsigned char *sStringOfChars)
{
int i;
int nChr;
int nTot;
int nDigit;

nTot = 0;
for (i = 0; i < 9; i++)
{
nChr = character i of pString
if (nChr > 0) nTot += (nChr * (23 - (i + 1)));
}
nDigit = (23 - (nTot % 23));
return character nDigit of sStringOfChars
}

Not done any C++ for years, cannot remember a thing (doh!).
Anyone help with the above two lines :
nChr = ...
return ...

[Yonatan]

Not sure exactly what the function is supposed to do, but in general:

c = SomeString[n]; // copies the n'th char of SomeString to c, where n is zero-based

[jim mcnamara]

This is like a checksum module.

Try:

char FormatID(unsigned char *pString, unsigned char *sStringOfChars)
{
          int i=0;
          char *nChr;
          int nTot=0;
          for (nChr=pString,i=0; i<9;i++,nChr++){
          	if(*nChr) nTot+=(nChr*(23-(i + 1)));
          }
          return (char)(23-(nTot % 23));
}