Sorry, I screwed up. I skimmed the question and mis-remebered it when making my post. I thought the question looked like:

  for(i=0...
    for(j=0...
      A[i][j]=0;

vs

  for(i=0...
    for(j=0...
      A[j][i]=0;

In which case C vs Fortran makes a difference to the way multidimensional arrays are stored in memory.