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

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Internal subprogram • Main program includes, just before END PROGRAM statement: CONTAINS subprogram_1 subprogram_2 subprogram_3 • Ok, let’s see the main program for our temperatures conversion program.
Method of Execution • Main program as usual until the assignment statement containing the reference to the function. • Actual argument ‘FahrenheitTemp’ is copied to ‘Temp’ argument in function. • Control is transferred from the main program to the function subprogram, which begins execution. • Assignment statement is evaluated using ‘Temp’ • Value computed is returned as the value of the function. • Control is transferred back to the main program <strong>and</strong> the value of the function is assigned to ‘CelsiusTemp’. • Execution continues on through the remainder of the main program.
Page 1 and 2: FORTRAN 90: Functions, Modules, and
Page 3 and 4: Functions • Intrinsic, or library
Page 5 and 6: Specification/Execution Sections
Page 7: Main program syntax • This subpro
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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