Explicit and implicit interfaces
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Explicit: in the same compilation unit, or imported interface
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Required for certain uses such as POINTER dummies and assumed-shape array dummies
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Implicit: as in FORTRAN 77
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INTERFACE blocks provide explicit interfaces
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Define types of parameters and return values
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MODULE provides type-safe libraries
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Contains declarations, functions, and type definitions
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All interfaces collected in one place
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PRIVATE data and procedures allowed
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USE imports the interfaces
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