Re: how to create unsigned hexadecimal initial value

["Leif Svalgaard" <leif@xxxxxxxx>]

From: <Gene_Gaunt/ReviewWorks@reviewworks.com>

> Now this is getting interesting.
> 
> DCL DD A(8) AUTO CHAR(4) INIT((8) X"FFFFFFFF");
> AND(S) A(1), H"1";
> AND(S) A(2), H"12";
> AND(S) A(3), H"123";
> AND(S) A(4), H"1234";
> AND(S) A(5), H"12345";
> AND(S) A(6), H"123456";
> AND(S) A(7), H"1234567";
> AND(S) A(8), H"12345678";
> BRK "LOOK";
> PEND;
> 
> STRDBG
> ADDBKP LOOK PGMVAR(A) OUTFMT(*HEX)
> 
> 1:   01000000
> 2:   12000000
> 3:   23000000
> 4:   34000000
> 5:   00012345
> 6:   00123456
> 7:   01234567
> 8:   12345678

If you replace AND(S) with CPYBLA, you get

1   01FFFFFF 
2   12FFFFFF 
3   23FFFFFF 
4   34FFFFFF 
5   00012345 
6   00123456  
7   01234567  
8   12345678

This clearly shows that *both* AND and CPYBLA suffer the same
problem (that only the low-order byte is used for H literals 4 hex-digits 
or shorter). Thus that the problem is with the H literal rather than with
the instructions. Note, also the (correct) difference between
CPYBLA A(6), H'123456'  = 00123456   and
CPYBLA A(6), X'123456'  = 123456FF
So, don't just blindly replace H with X.
    

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