Shoutbox

I don't know why you are getting incorrect results.  The reason I compiled your code was because I looked it over and couldn't find any problems -- and it works fine here, as expected.

I might download Dev-C++ and see if I can duplicate your problem later this evening.

As for your other question, try:

printf("ax\375+bx+c=0 \n");

375 is the octal value for the ² character in the PC OEM character set used by Windows console.