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Using and Porting GNU Fortran

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14.1.1 Language Extensions

g77 offers several extensions to FORTRAN 77 language that f2c doesn't:

g77 also implements iterative DO loops so that they work even in the presence of certain "extreme" inputs, unlike f2c. See section 14.3 Loops.

However, f2c offers a few that g77 doesn't, such as:

It is expected that g77 will offer some or all of these missing features at some time in the future.

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