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Problem of UDF using fortran programs

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Old   October 12, 2011, 11:07
Default Problem of UDF using fortran programs
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I want to use fortran program in my UDF.
This fortran program includes some functions and subrountines.
However, when I compile this fortran program and make it by UDF, it cann't work is the the fortran program has "write() ", or "read() ".
Is it permitted to use these print or read function in a UDF-fortran program?
Why I can not use them?
By the way, I use linux operating system.
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