hi,

thanks, you got it!

BTW, with logic way, it may be wrote with one line (that we call "bad style" :)

b = a^b^(a=b);

...but strange thing appears: Visual C++ compiles it with correct way, and Keil C does not do.

Another thing is that we are in C51 forum. You know, 8051 has fine instruction XCH A,.... which may help with our task alot. Unfortunatelly, I have not found a way to say C-compiler to use it when I need to exchange two variables :(

Regards,
Oleg