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How can i display / define the negative values assembler?

 
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GAFUR

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Joined: 19 May 2005
Posts: 31

PostPosted: Thu Mar 13, 2008 7:54 pm    Post subject: How can i display / define the negative values assembler?
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Hello ,


I have a preliminary question about assembler. How can i display negative values using WTO macro.



thanks,
Gafur
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Bill O'Boyle

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Joined: 14 Jan 2008
Posts: 2504
Location: Atlanta, Georgia, USA

PostPosted: Thu Mar 13, 2008 8:22 pm    Post subject: How can i display / define the negative values assembler?
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Ultimately, you'd have to UNPACK the data into a display-workarea large enough to hold the number, such as a CL16.

Then, test the source-field of this data and determine of it's positive or negative and insert the appropriate sign in the 1st-byte of the CL16.

If the source-data is in a halfword or fullword, then you're going to have to load it into a work-register and issue a CVD into an aligned-doubleword, with the sign-nibble resolving to either a 4-Bit "C" or "D", with the latter representing a negative value.

Now, you could be fooled if the halfword value exceeds 32767, but it really represents a positive value, such as 65535. So, I would move the halfword to the low-order of a fullword work-area, clear the high-order of the fullword to X'0000' and then load this fullword into the work-register, followed then by the CVD.

To me, this is an easy method and you don't need to define an edit-pattern and use the ED instruction (YUK!).

HTH....

Regards,

Bill
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