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Language Assembler (S/390)
| Date: | 04/20/05 |
| Author: | Anonymous |
| URL: | n/a |
| Comments: | 0 |
| Info: | n/a |
| Score: |  (3.05 in 22 votes) |
BEER TITLE '99 BOTTLES OF BEER ON THE WALL'
*+--------------------------------------------------------------------+
*¦ ¦
*¦MODULE NAME :BEER ¦
*¦ ¦
*¦FUNCTION :DISPLAY 99 BOTTLES OF BEER ON THE WALL ON THE ¦
*¦ :SYSTEM CONSOLE. ¦
*¦ ¦
*¦ENVIRONMENT :Z900 SYSTEM (S/390) RUNNING ZOS. ¦
*¦ ¦
*+--------------------------------------------------------------------+
*--------------------------------------------------------------*
* PROGRAM ENTRY POINT. *
*--------------------------------------------------------------*
BEER CSECT
* *-----------------------------------------------------*
* * SAVE CALLER'S ENVIRONMENT. *
* *-----------------------------------------------------*
STM R14,R12,12(R13) SAVE CALLER'S REGS.
* *-----------------------------------------------------*
* * BUILD OUR EXECUTION ENVIRONMENT. *
* *-----------------------------------------------------*
LA R12,0(,R15) COPY OVER BASE REGISTER.
USING BEER,R12 ASSIGN BASE.
LA R3,RSA POINT TO OUR RSA.
ST R3,8(,R13) SAVE IN CALLER'S RSA.
ST R13,4(,R3) CHAIN CALLER'S TO OURS.
LR R13,R3 SET UP OUR RSA.
*--------------------------------------------------------------*
* NUMBER OF BEERS LOOP. *
*--------------------------------------------------------------*
LA R4,99 NUMBER OF BEERS.
BEERLOOP DS 0H
* *-----------------------------------------------------*
* * CREATE A PRINTABLE NUMBER FROM INTEGER. *
* *-----------------------------------------------------*
CVD R4,DWORD CONVERT FIXED TO DECIMAL.
MVI WORK,C' ' PLACE SEED.
MVC WORK+1(L'WORK-1),WORK PROPIGATE SEED.
MVC WORK(8),=X'4020202020202120'
LA R1,WORK+5 DEFAULT TO LAST BYTE.
EDMK WORK(8),DWORD+4 UNPACK NUMBER.
* *-----------------------------------------------------*
* * MODIFY MESSAGES WITH BEER NUMBER. *
* *-----------------------------------------------------*
MVC MSG1+4(2),0(R1) COPY OVER NUMBER OF BEERS.
MVC MSG2+4(2),0(R1) COPY OVER NUMBER OF BEERS.
MVC MSG4+4(2),0(R1) COPY OVER NUMBER OF BEERS.
* *-----------------------------------------------------*
* * ISSUE MESSAGE TO CONSOLE PRAISING THE NUMBER OF *
* * BEERS. *
* *-----------------------------------------------------*
WTO MF=(E,MSG1) ISSUE MESSAGE.
WTO MF=(E,MSG2) ISSUE MESSAGE.
WTO MF=(E,MSG3) ISSUE MESSAGE.
WTO MF=(E,MSG4) ISSUE MESSAGE.
* *-----------------------------------------------------*
* * DECRIMENT BEER COUNT AND LOOP UNTIL DONE. *
* *-----------------------------------------------------*
BCT R4,BEERLOOP LOOP AROUND.
*--------------------------------------------------------------*
* EXIT PROGRAM SUCCESSFULLY. *
*--------------------------------------------------------------*
EXIT DS 0H
L R13,4(,R13) POINT TO CALLER'S RSA.
LM R14,R12,12(R13) RESTORE CALLER'S REGISTERS.
XR R15,R15 ZERO RETURN CODE.
BR R14 RETURN TO CALLER.
*--------------------------------------------------------------*
* CONSTANTS AND LITERAL POOL. *
*--------------------------------------------------------------*
RSA DC 18A(0) REGISTER SAVE AREA.
DWORD DC D'0' DOUBLE WORD.
WORK DC XL256'00' WORK AREA.
MSG1 WTO 'XX BOTTLES(S) OF BEER ON THE WALL,',MF=L
MSG2 WTO 'XX BOTTLES(S) OF BEER.',MF=L
MSG3 WTO 'TAKE ONE DOWN, PASS IT AROUND,',MF=L
MSG4 WTO 'XX BOTTLE(S) OF BEER ON THE WALL.',MF=L
R0 EQU 0
R1 EQU 1
R2 EQU 2
R3 EQU 3
R4 EQU 4
R5 EQU 5
R6 EQU 6
R7 EQU 7
R8 EQU 8
R9 EQU 9
R10 EQU 10
R11 EQU 11
R12 EQU 12
R13 EQU 13
R14 EQU 14
R15 EQU 15
END ,
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