Luca

The use of the 'real' 'printf()' is truely obsolete, because it's sole argument is a constant (at the end of the loop it is always 10). So, if turned to the top, the 'printf("...%d..n",i)' might be replaced by 'puts("...10..")', just to blend the user...

So I think you can't compare the "framework", only the pure algorithm.
Another fact is, that some library functions might be coded in tricky assembler, which is not for uC/51 ('printf()' sources are supplied in C, do the others supply sourcecode too?)

Jürgen