下班前，写了个简单的程序，作为例子说明参数中OPTIONS（*NOPASS）的用法，现与大家分享，共勉！
程序的作用是封装了系统API,EERAN0,用以返回4位的随机数，至于哪两四位整数之间的随机数，通过传递参数的个数和参数的值来决定，不传参返回1000-9999之间的随机四位整数。
一、程序列表如下：
二、程序源码如下：
USUSRVCDRT:
* ------------------------------------------------------------------------
* MEMBER : USUSRVCDRT
* AUTHOR : XIAOZL
* DESCRIBE : US - Create Random Number
* DATE : 2013-09-02
* ------------------------------------------------------------------------
/IF DEFINED(US_USUSRVCDRT_COPYED)
/EOF
/ELSE
/DEFINE US_USUSRVCDRT_COPYED
/ENDIF
* ------------------------------------------------------------------------
D/IF DEFINED(USUSRVCDR)
D USUSRVCDR PR 4S 0
D iMinNbr 5S 0 VALUE OPTIONS(*NOPASS)
D iMaxNbr 5S 0 VALUE OPTIONS(*NOPASS)
D/ENDIF
USUSRVCDRI:
* ------------------------------------------------------------------------
* MEMBER : USUSRVCDRP
* AUTHOR : XIAOZL
* DESCRIBE : US - Create Random Number
* DATE : 2013-09-02
* ------------------------------------------------------------------------
HNOMAIN DATFMT(*ISO)
*
D/DEFINE USUSRVCDR
D/COPY XXXZL2/QRPGSRC,USUSRVCDRT
*
P USUSRVCDR B EXPORT
D USUSRVCDR PI 4S 0
D iMinNbr 5S 0 VALUE OPTIONS(*NOPASS)
D iMaxNbr 5S 0 VALUE OPTIONS(*NOPASS)
D USUSRVCDR PR 4S 0
D iMinNbr 5S 0 VALUE OPTIONS(*NOPASS)
D iMaxNbr 5S 0 VALUE OPTIONS(*NOPASS)
*
D CEERAN PR Extproc('CEERAN0')
D P_SEED LIKE(I_SEED)
DP_RANDOM LIKE(F_RANDOM)
*
DI_SEED S 10I 0 INZ(0)
DF_RANDOM S 8F
*
DRNDNBR S 10I 0
DMINNBR C CONST(1000)
DMAXNBR C CONST(10000)
DoRtnNbr S 4S 0
*
C EXSR #Init
C EXSR #Main
C RETURN oRtnNbr
*
CSR #Init BEGSR
CSR ENDSR
*
CSR #Main BEGSR
C SELECT
C WHEN %PARMS = 0
C CALLP CEERAN(I_SEED:F_RANDOM)
C EVAL RNDNBR = %DECH(F_RANDOM:30:29)
C *(MAXNBR-MINNBR)+MINNBR
C MOVE RNDNBR oRtnNbr
*
C WHEN %PARMS = 1
C CALLP CEERAN(I_SEED:F_RANDOM)
C EVAL RNDNBR = %DECH(F_RANDOM:30:29)
C *(MAXNBR-iMinNbr)+iMinNbr
C MOVE RNDNBR oRtnNbr
*
C WHEN %PARMS = 2
C CALLP CEERAN(I_SEED:F_RANDOM)
C EVAL RNDNBR = %DECH(F_RANDOM:30:29)
C *(iMaxNbr-iMinNbr)+iMinNbr
C MOVE RNDNBR oRtnNbr
C ENDSL
CSR ENDSR
P USUSRVCDR E
USUSRVCDRP:
D/DEFINE USUSRVCDR
D/COPY XXXZL2/QRPGSRC,USUSRVCDRT
*
DoDspNbr S 4S 0
*
* Get the Random Number Between 1000 - 10000
*
C EVAL oDspNbr = USUSRVCDR()
C oDspNbr DSPLY
*
* Get the Random Number Between 5000 - 10000
*
C EVAL oDspNbr = USUSRVCDR(5000)
C oDspNbr DSPLY
*
* Get the Random Number Between 1000 - 2000
*
C EVAL oDspNbr = USUSRVCDR(1000:2000)
C oDspNbr DSPLY
*
C SETON LR
C RETURN
四、程序编译参考：
CRTRPGMOD MODULE(MYOBJLIB/USUSRVCDRI) SRCFILE(MYSRCLIB/QRPGSRC) SRCMB(USUSRVCDRI)
CRTRPGMOD MODULE(MYOBJLIB/USUSRVCDRP) SRCFILE(MYSRCLIB/QRPGSRC) SRCMB(USUSRVCDRP)
CRTPGM PGM(MYOBJLIB/USUSRVCDRP) MODULE(MYOBJLIB/USUSRVCDRP MYOBJLIB/USUSRVCDRI)
五、CALL USUSRVCDRP，查看作业日志可以看到如下效果：