FW: [C400-L] add long strings as unsigned integers

["Bob Crothers" <bob@xxxxxxxxxxxxxx>]

Gene,

Did the below help you at all?

Bob

> -----Original Message-----
> From: Bob Crothers [mailto:bob@xxxxxxxxxxxxxx] 
> Sent: Friday, November 14, 2003 11:09 AM
> To: 'C programming iSeries / AS400'
> Subject: RE: [C400-L] add long strings as unsigned integers
> 
> 
> Gene,
> 
> Without actually writing the program, below is how I would 
> approach it:
> 
> bool Add3Values(BYTE val1, BYTE val2, BYTE val3, BYTE 
> *Result, BYTE *CarryResult)
> {
>   // Add the 3 values together coming up with Result and
CarryResult
>   // If CarryResult overflows, return false, else return true
>   //  CarryResult happens if adding x'FF' + x'FF' + x'FF' 
> }
> 
> AddStrings(BYTE *Str1, BYTE *Str2, BYTE *Result, int resLen)
> {
>       // First, right adjust Str1 and Str2 making them the 
> same length.
> 
>       // Next, make sure that resLen is at least 1 byte 
> larger then the largest
>       // of Str1 & Str2
> 
> BYTE CarryValue = 0;
> 
> For (int x = LargestLenOfStr1and2; x > 0; x--)
>       {
>       if (!Add3Values(Str1[x], Str2[x], &Result[x],
&CarryValue))
>               {
>               printf("Overflow has Overflowed!  Croaking");
>               exit(-1);
>               }
>       }
> 
>       // Now do something with Result.
> }
> 
> Bob Crothers
>   
> 
> > -----Original Message-----
> > From: c400-l-bounces@xxxxxxxxxxxx 
> > [mailto:c400-l-bounces@xxxxxxxxxxxx] On Behalf Of 
> > Gene_Gaunt@xxxxxxxxxxxxxxx
> > Sent: Thursday, November 13, 2003 4:31 PM
> > To: C400-L@xxxxxxxxxxxx
> > Subject: [C400-L] add long strings as unsigned integers
> > 
> > 
> > How would you code addition of arbitrarily wide strings in 
> C language?
> > For example
> > 
> >    x'88 00 00 00 88 00 00 00 00 22 00 00 00 33 00 00 E4'
> > +  x'88 00 00 00 F1 00 11 00 11 00 22 00 22 00 22 00 33'
> >    ------------------------------------------------------
> > =  x'10 00 00 01 79 00 11 00 11 22 22 00 22 33 22 01 17'
> > 
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>