Fortran Compiler Terminology: Dummy Variables and Attributes -

Can anyone explain to me that there is a dummy variable or feature in the parser / compiler? Pure (former)> Pure Synthesis F (X, Y) Actual, IntOUT :: X, Y, CC Real: A, BC Real, SAVE :: C = 3.14E0 parameter (C) = 3.14) E0, X = 32, Y = X) X = Y + 2 * SIN (Y) END

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  cetin @ unique: ~ / lab / secret / Tapenade $ gafforan-xf 77-c 1.f 1.f: 6.37: parameter (c = 3.14E, x = 32, y = x) 1 error: in the parameter 'x' (1) 1.f Conflict with dummy characteristic: 3.38: Real, INTENT (INOUT) :: X, Y, C1 Error: Symbol (1) is not a dummy variable  

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  cetin @ unique: ~ / lab / secret / tapenade $ ifort -c 1.f 1.f (3): error # 6451: a dummy logic n ame is required in this context [c] real, intent (INOUT ) :: X, Y, C ---------------------------------- --- ^ 1.F ( 6): Error # 6406: Multiple declarations of anti attributes or names. [X] parameter (c = 3.14E, x = 32, y = x) ------------------------------- ^ 1.F (6): Error # 6406: Multiple declarations of anti attributes or names. [Y] parameter (C = 3.14E, X = 32, Y = X) ------------------------------- - ------- ^ 1.f (6): Error # 6592: This symbol should be the argument of a defined parameter, a calculator, or an investigation function which evaluates for compile-time constants [x] Parameter (C = 3.14E, X = 32, Y = X) ---------------------------------  > 
 Fortran passes through context. The dummy attribute corresponds to those variables that are passed in the function (in  X  and  Y  in your case). The parameter description is expected to be somewhat stable, but since it is passed in the  X  function, it does not really mean any kind since. There is a way to set the parameter statement constants - it has nothing with any sub-routine parameters. 
 
 When you get an error saying that  C  is not a  dummy  variable, then, that means they do not search in the list of variables The functions that will be passed through / in the - Your announcement is only  F (x, y) : no  c  in sight though you  dummy  Are not explicitly using the attribute, you have the  INTENT (INOUT)  attribute, which means that these variables are consistent with the subroutine input / output. 
 
 To achieve whatever you want, you have a substrate that looks like this: 
 
  Suburban F (X, Y) None is contained! These dummy variables are real, intro (out) :: X, Y! These substrines are variables in the real real :: A, B real, parameter, save :: c = 3.14E0x = y + 2 * sin (y) and substrin f  
 
 me full Not sure what you are trying to do - you're announcing the  net  suburban word, which means without a side effect, a subarroutine, but you  intent (inout) Is using  for your variable, which means that  X  and  y  can be changed during execution.  
 By submitting a variable in the declaration declaration of a sub method,  REAL :: C = 3.14E0 ,  contained   save < Generates a variable with / code> attribute If you want to save it from call to call, you have done the right thing by clearly adding the  save  attribute to make it clear that you are doing. 
 
 I am not a parser / compiler, but I think that to answer your question,  dummy  attribute means that you are getting only one indicator - You do not need any allocation space, because the variable used in the function call already has allocated space.