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Error in compile

JohnNichols
Valued Contributor III
‎01-13-2026 03:57 PM
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write(*,9)

 

where 9 is an undefined format does not throw an error or warning.  I had a stack drawing a straight line in the output, deleted 9 and it all kept compiling, pretty sure that is not a good idea.

Whoever said arithmetic if's are a bad idea is a Fortran Saint now. 

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Steve_Lionel
Honored Contributor III
‎01-13-2026 05:40 PM
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t.f90(1): error #6052: This label has not been defined as a FORMAT label.   [9]
write(*,9)
--------^
compilation aborted for t.f90 (code 1)

D:\Projects>

How about providing a compilable source that reproduces the problem? These minimal snippets waste everyone's time.

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