[downquark1]

will try the main error in a moment:

for starters:

System.out.println("3.5 Miles Converted into inches" = mile * yard * feet + inches);

The = needs to be within the string and you need a string appending operator, in java I think its + but not sure so it should be

System.out.println("3.5 Miles Converted into inches = " + (mile * yard * feet + inches));

But I'm currently thinking in C++ so may get a bit wrong.