fortran array c array. ridiculous macro tricks wanted

i have 'simplified' fortran code

real b(100, 200) 
real a(100,200)

... initialize b array code.

do i = 1, 100
  j = 1, 200
    a(j,i) = b(j,i)
  finish do
end do

one programming gurus warned me, fortran accesses information good buttress order, while c accesses information good quarrel order. suggested i take good tough feeling during code, prepared switch loops around say speed aged program.

being idle programmer i am, noticing days bid involved, mistakes i am approaching make, i started wondering there competence #define technique let me modify formula safely, easily.

do have any suggestions?