Master programming syntax, solve interactive challenges & run live code in Syntaxis Explore Arena →
menu_book Course Curriculum (Fortran) expand_more
Program and Types
Program unit Implicit none Integer variables Real variables Double precision kind Logical values Character strings Parameters constants Kind selection Derived types
Arrays
Array declarations Array constructors Array sections Whole-array assignment Elemental operations Where construct Forall legacy concept Allocatable arrays Array intrinsics sum Array intrinsics matmul
Control Flow
If then else Select case Do loops Do while Cycle Exit Associate construct Block construct Select type Select rank
Procedures
Functions Subroutines Intent in Intent out Intent inout Optional arguments Keyword arguments Pure procedures Elemental procedures Recursive procedures
Modules and Types
Modules Use statement Only imports Private and public Module procedures Type-bound procedures Type extension Abstract types Deferred bindings Generic interfaces
Memory and Pointers
Allocatable variables Allocate Deallocate Pointers Pointer association Nullify Move_alloc Automatic arrays Contiguous attribute Target attribute
Files and Formatting
Print statement Formatted write Formatted read Open files Close files Read file records Write file records Iostat error handling Internal files Namelist I/O
Numerics Parallel Testing
Dot_product Transpose Minval and maxval Random_number ISO_FORTRAN_ENV ISO_C_BINDING Coarrays Do concurrent OpenMP directive concept Error stop
Fortran / Control Flow

Select rank

Learn Select rank in Fortran through a focused explanation, a dedicated topic-specific example, an engineering boundary, and a mastery check.

10 min read • Beginner

Select rank is a focused Fortran lesson inside Control Flow. The example uses the construct named in the lesson directly rather than reusing a generic placeholder.

Trace the example from its inputs through Select rank and identify the behavior that would change if that construct were removed or replaced. Pay attention to the language-specific rules shown by the syntax, because neighboring lessons intentionally exercise different mechanisms.

Topic-specific example

fortran-0030-cc81753bf5.f90
fortran Try It Live 
program demo
  implicit none
  integer :: values(3) = [31, 32, 33]
  print *, sum(values) ! Select rank
end program demo
Edge case / engineering note

For Select rank, test one realistic boundary: empty data, invalid input, unavailable resources, lifetime/cleanup, type constraints, or concurrency timing where applicable. A successful happy path is not enough to prove the construct is used correctly.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

Select rank Mastery Check →
← PREVIOUS
Select type
NEXT →
Functions