fortran 编程问题
参照《化工过程计算机辅助设计基础》43页例题我把优化之前的程序运行了一下，没有问题，但一优化，就出现问题。请教问题出在哪里：
优化变量
FH Stream-Var Stream=1 Substream=MIXED Variable=MOLE-FLOW
FT Stream-Var Stream=2 Substream=MIXED Variable=MOLE-FLOW
PB Stream-Var Stream=3 Substream=MIXED Variable=MOLE-FLOW
PD Stream-Var Stream=4 Substream=MIXED Variable=MOLE-FLOW
YPH Mole-Frac Stream=5 Substream=MIXED Component=H2
PG Stream-Var Stream=5 Substream=MIXED Variable=MOLE-FLOW
fortran 程序：
c 燃料价格，$/106kj
CF=4.22
c 热值，106kj/kmol
dHCH=0.29
dHCM=0.89
dHCB=3.28
dHCT=3.91
dHCD=6.25
c 苯的价值，$/kmol
CB=19.93
c 甲苯的价值，$/kmol
CT=14.11
c 进料氢气的价值，$/kmol
CH=2.51
C 全年运行时间，h/a
Cita=8150.0
C 经济潜力，$/a
COSTin=CH*FH+CT*FT
COSTout=CF*(PG*(YPH*dHCH+(1-YPH)*dHCM)+PD*dHCD)+CB*PB
COST=(COSTout-COSTin)*Cita
我运行后出现：
->Processing input specifications ...
INFORMATION IN THE "OPTIMIZATION" PARAGRAPH WHICH BEGINS ON LINE 96
FIRST ID: O-1
FORTRAN IN OPTIMIZATION BLOCK WITH ID: O-1 WILL BE COMPILED
RATHER THAN INTERPRETED BECAUSE OF THE FOLLOWING STATEMENT:
COSTOUT=CF*(PG*(YPH*DHCH+(1-YPH)*DHCM)+PD*DHCD)+CB*PB
*** SEVERE ERROR
ERROR COMPILING IN-LINE FORTRAN
COMPILER MESSAGES FOLLOW ...
*** SEVERE ERROR
COULD NOT RESOLVE USER OR IN-LINE FORTRAN SUBROUTINE(S):
SUBROUTINE "ZZOPT" IS MISSING
*** SEVERE ERROR
PROGRAM TERMINATED DUE TO UNRESOLVED ROUTINES
! Errors while processing input specifications
->Processing input specifications ...
INFORMATION IN THE "OPTIMIZATION" PARAGRAPH WHICH BEGINS ON LINE 96
FIRST ID: O-1
FORTRAN IN OPTIMIZATION BLOCK WITH ID: O-1 WILL BE COMPILED
RATHER THAN INTERPRETED BECAUSE OF THE FOLLOWING STATEMENT:
COSTOUT=CF*(PG*(YPH*DHCH+(1-YPH)*DHCM)+PD*DHCD)+CB*PB
*** SEVERE ERROR
ERROR COMPILING IN-LINE FORTRAN
COMPILER MESSAGES FOLLOW ...
*** SEVERE ERROR
COULD NOT RESOLVE USER OR IN-LINE FORTRAN SUBROUTINE(S):
SUBROUTINE "ZZOPT" IS MISSING
*** SEVERE ERROR
PROGRAM TERMINATED DUE TO UNRESOLVED ROUTINES
! Errors while processing input specifications
附上程序，见附件
{:1106_369:}
{:1106_364:} 这个还不会，没有做过。
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