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simon
Joined: 05 Jul 2006
Posts: 299
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 Posted: Wed Aug 07, 2019 11:44 pm Post subject: List-directed output |
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Is it possible to provide a character variable to the FMT qualifier in a WRITE statement so that the default format (i.e., list-directed) output is used? To illustrate, I want to perform:
| Code: | | Write (Unit=*, Fmt=*) i |
but as something like the following (which generates and error message):
| Code: | cfmt = '*'
Write (Unit=*, Fmt=cfmt) i |
The following also generates an error:
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mecej4
Joined: 31 Oct 2006
Posts: 1899
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| Posted: Thu Aug 08, 2019 1:05 am Post subject: |
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I don't see why you want to do that, but here is a way around the restriction that '*' is not an acceptable format string:
| Code: | if (cfmt == '*') then
Write (Unit=*, Fmt=*) i
else
Write (Unit=*, Fmt=cfmt) i
endif |
There are many places in Fortran where '*' stands for 'default', 'acceptable subset', etc., but the '*' cannot be replaced by a string variable whose value is '*', because the '*' has to be seen at compile time.
Similarly, in the Write statement above, the first * appears in a place where an integer value or integer variable can be present. However, one cannot write
| Code: | iunit=*
Write (Unit=iunit,...)
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simon
Joined: 05 Jul 2006
Posts: 299
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| Posted: Thu Aug 08, 2019 7:27 pm Post subject: |
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| The reason I want to be able to use something like cfmt='*' is because I have hundreds of lines of output code. Sometimes I want to be able to output using a specific format, and other times I am content simply with whatever the list-directed output provides. I will have to duplicate all those hundreds of lines if I have to use the "If ... Else" structure. It would be much easier to manage the code, including making modifications to the output, if I had only one set of Write statements to deal with. |
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