FORTRAN 90: Functions, Modules, and Subroutines (pdf format)

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FUNCTION statement • FUNCTION function-name (formal-argument list) OR • type-identifier FUNCTION function-name (formal-argument list) • Function-name: any legal Fortran identifier. • Formal-argument list: identifier or a list of identifiers separated by commas – Formal or dummy arguments – Pass information to the function sub-program • type-identifier: name of a type (REAL, INTEGER, etc.)
Specification/Execution Sections • Same form as the specification part of a Fortran program plus: – The type of the function if this has not been included in the function heading. – The type of each formal argument. • INTENT specifier: tells how the arguments are to transfer information. • Execution section has same form as Fortran program plus: – Include at least one statement that assigns a value to the identifier that names the function • Function-name = expression • END FUNCTION function-name • Aside: RETURN statement – RETURNS values of the function when executed. – Not necessary in Fortran 90, but is probably something you will run into.
Page 1 and 2: FORTRAN 90: Functions, Modules, and
Page 3: Functions • Intrinsic, or library
Page 7 and 8: Main program syntax • This subpro
Page 9 and 10: Method of Execution • Main progra
Page 11 and 12: Scope • May be several points whe
Page 13 and 14: Rule #2 • A global entity is acce
Page 15 and 16: Modules • Often similar calculati
Page 17 and 18: Translation to source program • T
Page 19 and 20: What are all these file types? •
Page 21 and 22: External Subprograms • Attached a
Page 23 and 24: • subroutine heading specificatio
Page 25 and 26: yet different • Functions are des
Page 27 and 28: Subroutine syntax • Subroutine he
Page 29: Argument association • Coordinate

FORTRAN 90: Functions, Modules, and Subroutines (pdf format)

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