Error: Nonnegative width required in format string at (1)

Question

I\'m trying to compile a piece of code with gfortran and it\'s failing with the following error:

Error: Nonnegative width required in format string at (1)
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Answer 1

Try changing the format string I to Iw where w is a positive number. Same with E, only use Ew.d.
For explanation see, for example, this link: http://www.cs.mtu.edu/~shene/COURSES/cs201/NOTES/chap05/format.html

Beware though: using, say, I3 for writing out 1234 might print ***, so make sure your formats are wide enough.

EDIT: See @M.S.B.'s answer on how to avoid problems with integer formats.