Should External Routine Be Declared Always in Fortran?

Posted by Ngu Soon Hui on Stack Overflow See other posts from Stack Overflow or by Ngu Soon Hui
Published on 2010-03-12T03:53:13Z Indexed on 2010/03/12 3:57 UTC
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fortran

In my fortran code I made the following call to dnrm2 routine

d = dnrm2(n, ax, 1)

Just a simple call that would return me a double precision result.

The problem is whether I should declare the function at the start of my script. I found that if I don't declare it, and when I compile the code in 32 bit Windows, then the result is correct.

But if I compile the code in 64 bit Windows, then the result won't be correct.

Why this is so? Is external routine must always be declared?

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as seen on Stack Overflow - Search for 'Stack Overflow'
In my fortran code I made the following call to dnrm2 routine d = dnrm2(n, ax, 1) Just a simple call that would return me a double precision result. The problem is whether I should declare the function at the start of my script. I found that if I don't declare it, and when I compile the code in… >>> More

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Should External Routine Be Declared Always in Fortran? - Developer IT

Should External Routine Be Declared Always in Fortran?

fortran

Related posts about fortran

passing a fortran int array to C++ by calling C++ function in fortran

MinGW/G++/g95 link problem - libf95 undefined reference to `MAIN_'

Fortran arrays and subroutines

fortran 90 user defined type, passing by value ?

Should External Routine Be Declared Always in Fortran?

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