Operating system, --> Linux(Fedora 6)
Programming language or what compiler --> C++/g++ compiler

What changes I had made.--> first of all I was calling my own made function and not collecting what it is returning.....then I simply taken a variable and collected a returned value from that function.......that compilation error then disappers.

I am not using the concept of class here simply defining a function and calling it main.

So I just only want to know that what that error means because I had never seen it before & what is compound expression?????????