The earliest version of the Fortran compiler had a number of constraints (or missing features). One of these was...

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Accepted Answer

It could not independently compile separate source code units

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It did not support subprograms

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Actually, all three of these options represent missing features in the first version of Fortran. They were all fixed in Fortran II.

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It had integers but no floating point data type

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Actually, none of these options were missing - Fortran was successful because it supported all of them

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