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karthi_ind
Active User
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Joined: 24 Feb 2004
Posts: 131
Location: Chennai
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Hi,
Could you help me out on this.
Display the two's complement value from 1 to n numbers thru assembler program. Pls guide me on this. |
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enrico-sorichetti
Superior Member
Joined: 14 Mar 2007
Posts: 10873
Location: italy
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since this not something we usually do/have done we would need to do it just for Your sake
review the TWO complement notation for short numbers ( 4 bits , 0 to 15 ) doing it by pencil and paper
after that expand the logic to longer number |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
Is this a binary number?
You might try multiplying n by -1 (negative one) and see if the result is what you want. . . |
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Bill O'Boyle
CICS Moderator
Joined: 14 Jan 2008
Posts: 2501
Location: Atlanta, Georgia, USA
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For register usage, with a positive number in Rx (R14 in this example), review the LCR (Load Complement Register) instruction.
EG:
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LA R14,15 LOAD WITH X'0000000F'
LCR R15,R14 LOAD WITH TWO'S COMPLEMENT (R14 PRESERVED)
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Bill |
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