如何在此COMMON语句中指定类型? [英] How are the types in this COMMON statement specified?
问题描述
我有一个旧的fortran代码，我试图对其进行解密并了解正在发生的事情，因此我可以对其进行修改.不幸的是，我在fortran中还是个新手，所以我很难弄清这个说法.
I have an old fortran code that I am attempting to decipher and understand what is going on so I can modify it. Unfortunately I am a bit of a neophyte in fortran so I am having trouble figuring out this statement.
C 15/04/97 IBM VERSION ECIS96 CALC-000
SUBROUTINE CALC(W,NW,DW,IDMX) CALC-001
C MAIN SUBROUTINE OF THE PROGRAMME CALC-002
C W,NW,DW ARE THE WORKING SPACE IN EQUIVALENCE BY CALL,STARTING AS CALC-003
C REAL*8. THEY ARE RESPECTIVELY REAL, INTEGER AND DOUBLE PRECISION. CALC-004
C IDMX IS THE LENGTH OF DW. CALC-005
C CALC-006
C ADDRESSES IN THE WORKING FIELD DEFINED HERE (FOR OTHERS, SEE CALX) CALC-007
C IN COMMON /DECOU/ CALC-008
C 34- NT HERE, ALSO REDUCED NUCLEAR MATRIX ELEMENTS CALC-009
C 35- NIVQ TABLE OF MULTIPOLES CALC-010
C 36- NIVY TABLE OF FORM FACTOR IDENTIFICATION IVY (FOR COMPUTATION)CALC-011
C 37- NIVZ TABLE OF FORM FACTOR IDENTIFICATION IVZ (FOR USE) CALC-012
C 38- NCOI ADDRESS OF THE TABLE FOR DISCRETISATION OF CONTINUUM CALC-013
C 39- MIPI SAME AS NIPI FOR THE DISCRETISATION OF CONTINUUM CALC-014
C 40- NXD ADDRESS OF WEIGHTS AND STEPS OF CONTINUUM CALC-015
C 41- MWV SAME AS NWV FOR THE DISCRETISATION OF CONTINUUM CALC-016
C 42- NIXT TRANSMISSION COEFFICIENTS OF UNCOUPLED STATES CALC-017
C 43- NTY TEMPORARY RESULTS OF COMPOUND NUCLEUS FOR INTERPOLATION CALC-018
C 44- NTX PARTIAL REACTION CROSS SECTIONS AND COMPOUND NUCLEUS CALC-019
C 45- NRY COMPOUND NUCLEUS COEFFICIENTS CALC-020
C 46- NRCO STRENGTH OF COULOMB CENTRAL POTENTIALS FOR CORRECTIONS CALC-021
C 47- NRDO STRENGTH OF COULOMB TRANSITION POTENTIALS FOR CORRECTIONSCALC-022
C 48- NVC1 REAL POTENTIALS CALC-023
C 49- NVC2 IMAGINARY POTENTIALS CALC-024
C 50- NNC FIRST FREE ADDRESS AFTER COMPUTATION OF POTENTIALS CALC-025
C 51- NCX FIRST FREE ADDRESS FOR COMPUTATION OF POTENTIALS CALC-026
C OTHER INTEGER DATA OF COMMON /DECOU/ CALC-027
C 52- IDMT TOTAL WORKING FIELD LENGTH AS SINGLE PRECISION CALC-028
C 53-98 SEE CALX CALC-029
C 99- KXT NUMBER OF PENETRABILITIES FOR UNCOUPLED STATES CALC-030
C100- NRZ NUMBER OF RESULTS TO SAVE FOR MINIMUM CHI2 CALC-031
C101- NTZ NUMBER OF MEMRIES TO INITIALISE TO ZERO FOR SCATTERING CALC-032
C MATRIX AND COMPOUND NUCLEUS RESULTS CALC-033
C102- LMAX3 EFFECTIVE NUMBER OF COULOMB FUNCTIONS CALC-034
C103- IPM NUMBER PF J VALUES USED FOR SCATTERING MATRIX (IN CAL1) CALC-035
C104- IPK NUMBER PF J VALUES USED FOR COMPOUND NUCLEUS (IN CAL1) CALC-036
C105-110 SEE CALX CALC-037
C CALC-038
C IN COMMON /DBLPR/ CHI2,CHI2M: CHI-SQUARE AND MINIMUM CHI-SQUARE CALC-039
C CM,CHB: NUCLEAR MASS AND H BAR CALC-040
C CK,CMB,CCZ: DERIVED CONSTANTS CALC-041
C XE,XM,XN: RELATIVISTIC ENERGY AND MASS (COLF) CALC-042
C XZ: CONVERSION FACTOR TO MILLIBARNS CALC-043
C FOR COMMONS /POTE1/ AND /POTE2/ SEE REDM CALC-044
C FOR COMMON /NCOMP/ SEE CALX, LECT AND COLF CALC-045
C CALC-046
C*some information on logical variables that is unimportant to this*
DOUBLE PRECISION CHI2,CHI2M,CM,CK,CHB,CMB,CZ,CCZ,XE,XM,XN,XZ,DW(1)CALC-095
LOGICAL LO(250) CALC-096
DIMENSION W(1),NW(1) CALC-097
COMMON /DECOU/ NJIT,NIPP,NIPI,NWV,NIPH,NSCN,NPAR,NNIV,NFIS,NGAM,NPCALC-098
1OT,NBETA,NFM,NTGX,NDONN,NRC,NIW,NDE,NISE,NNVI,NNWI,NCC,MCC,NXA,NAMCALC-099
21,NFAC,NFAM,NPAD,NFG,NXG,NSM,NRES,NXX,NT,NIVQ,NIVY,NIVZ,NCOI,MIPI,CALC-100
3NXD,MWV,NIXT,NTY,NTX,NRY,NRCO,NRDO,NVC1,NVC2,NNC,NCX,IDMT,NCOLL,NJCALC-101
4MAX,ITERM,NPP,JDM,JIT,NSEC,LMD,MCM(2),NCOLS,NCOLT,KMAX,KMIN,NVA,NBCALC-102
5ET,NBT1,LMX,LMAX1,NLT,ISM,IQM,IQMAX,MS1,MS2,NCT(6),KBA,KAB,KBC,KCCCALC-103
6,NJC,JTX,JTH,NCOLR,NREC,NTOT,NFA,LMAX2,KE,ITEMM,NPLACE,KXT,NRZ,NTZCALC-104
7,LMAX3,IPM,IPK,H,BJM,EITER,ACONV,CONJ,ASPIN CALC-105
COMMON /DBLPR/ CHI2,CHI2M,CM,CK,CHB,CMB,CCZ,XE,XM,XN,XZ CALC-106
COMMON /POTE1/ ITX(16),IMAX,INTC,INLS,INVC,INVD,ITXM CALC-107
COMMON /POTE2/ ITY(8),INVT,INTV,INSL,NPX CALC-108
COMMON /NCOMP/ NSP(3),NFISS,NRD,NCONT,NCOJ,ACN1,ACN2,NCONS,NIE,NCOCALC-109
1LX,NDP,NDQ,AZ(6),BZ1,BZ2,BZ3,TG0,BN,FNUG,EGD,GGD,TG1,SGSQ CALC-110
如果有帮助，这就是调用函数的方式.
If it helps this is how the function is called.
C 18/12/87 IBM VERSION CONVEX ECIS88 ECIS-000
REAL*8 W(600000) ECIS-001
COMMON W ECIS-002
CALL CALC(W,W,W,600000) ECIS-003
STOP ECIS-004
END ECIS-005
我已经理解了行的延续，并且对于CALC-099到CALC-105的行，第一个非空白数字只是对延续进行计数，因为编译器将跳转到第7列进行延续.
I already understand the line continuations and that for lines CALC-099 through CALC-105 the first non-whitespace numbers are just counting the continuations since the compiler is jumping to column 7 for the continuation.
我不明白类型是如何确定的.这是第一次分配时自动确定的事情，我对通用块的工作原理的理解使这似乎不太可能.这是命名中的东西吗，第一个字符是否以某种方式确定了它?
What I do not understand is how the types are decided. Is it something automatically determined on first assignment, my understanding of how common blocks work makes this seem unlikely. Is it something in the naming, is the first character somehow determining it?
此外，维度语句在这里做什么?如果数组的长度为600,000，为什么维度语句将其长度设置"为1，或者正在执行我没有看到的操作?
Also, what are the dimension statements doing here? If the array is 600,000 long why is the dimension statement "setting" its length to 1, or is it doing something I am not seeing?
推荐答案
问题的两个部分都使现代人感到震惊.
Both parts of your question are something that horrifies modern people.
首先，隐式键入.变量，除非它们具有 explicit 类型，否则应采用隐式类型.以I-N开头的变量是INTEGER，其他则是REAL.但是，IMPLICIT语句将覆盖此内容，因此请注意这一点(永远不要低估程序员可以做什么).另外，请注意IMPLICIT NONE是该标准的更高版本.
First, implicit typing. Variables, unless they have an explicit type, take an implicit type. Variables beginning I-Nare INTEGER and others are REAL. The IMPLICIT statement overrides this, however, so look out for that (never underestimate what evils programmers can do). Also, note that IMPLICIT NONE is a later addition to the standard.
第二，在子例程DIMENSION(1)(或等效程序)中，它是DIMENSION(*)的替代方法.
Second, in subroutines DIMENSION(1) (or equivalent) was an alternative to DIMENSION(*).
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