Several. First, and most important, is that when you create a thread asking for help, make sure to explain what exactly is going wrong.
To make the compiler error go away, replace cout<< feet << " feet is " << meters= feet/3.28; with cout<< feet << " feet is " << (meters= feet/3.28);, you need to make it clear that the whole thing is 1 expression.
Next, you have a useless variable, you put information into meters, but you never read from it, that line would be identical to cout<< feet << " feet is " << feet/3.28;
Moving on, you are missing either an endl or \n to make it not display on 1 line.