But perhaps in "C" the size of the code is difficult to match the size written by assembly.

For example, a LCD routines using Hi-Tech "C" for PIC16F877 took 499 words (a word in this model is 14-bits). And I used MPASM to write the same routines took 149 words.

I'm not too sure whether did I program it badly or otherwise. Cause the code size difference is about 3.xx times.

Last but not least, using a "C" compiler can really save some time as well as simplify the development and maintenance progress considerably. Esp when dealing with floating points.

Best Regards
Andy