fortran90 - Using array member as the control variable of do loop in fortran -



fortran90 - Using array member as the control variable of do loop in fortran -

i surprised cannot set array fellow member command variable of loop this:

program test integer, dimension(2) :: i(1) = 1, 3 i(2) = 1, 3 ! here write(*, *) end end end programme

my question why not permitted?

edit: or permitted doing wrong?

the error message ifort v 11.1 is:

test.f90(4): error #5082: syntax error, found identifier 'i' when expecting 1 of: ( % : . = => i(1) = 1, 3 -------^ test.f90(4): error #5082: syntax error, found ',' when expecting 1 of: <end-of-statement> ; i(1) = 1, 3 ---------------^ test.f90(5): error #5082: syntax error, found identifier 'i' when expecting 1 of: ( % : . = => i(2) = 1, 3 -------^ test.f90(5): error #5082: syntax error, found ',' when expecting 1 of: <end-of-statement> ; i(2) = 1, 3 ---------------^ test.f90(4): error #6535: variable or component must of derived or construction type [do] i(1) = 1, 3 ----^ test.f90(4): error #6460: not field name defined in encompassing structure. [i] i(1) = 1, 3 -------^ test.f90(8): error #6099: enddo statement occurred without corresponding or while statement. end ----^ test.f90(9): error #6099: enddo statement occurred without corresponding or while statement. end ----^

the error message gfortran v4.5.1 & 4.8.3 is:

test.f90:4.4: i(1) = 1, 3 1 error: unclassifiable statement @ (1) test.f90:5.4: i(2) = 1, 3 1 error: unclassifiable statement @ (1) test.f90:8.7: end 1 error: expecting end programme statement @ (1) test.f90:9.7: end 1 error: expecting end programme statement @ (1)

sorry first wrong answer.

the restriction follows rules of language:

fortran 2008 (iso/iec 1539-1:2010) 8.1.6.2:

r818 loop-control is, do-variable = ...

r819 do-variable is, scalar-int-variable-name

c812 (r819) do-variable shall variable of type integer.

therefore yes, scalar variable name permitted @ position of loop command variable.

if inquire why rules of language this, have inquire authors of standard, sc22/wg5 , x3j3, guess connected necessity of syntactic unambiguity in fixed-source form. in fixed source form spaces not important , hard come unambiguous grammar.

fortran fortran90 do-loops

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