Bentley Huang says to YSITD[bentleyhuang@Bentleyde-MacBook-Pro Desktop]$ g++ c042.cpp Undefined symbols for architecture x86_64: "_main", referenced from: implicit entry/start for main executable ld: symbol(s) not found for architecture x86_64 collect2: error: ld returned 1 exit statusat Mon, Dec 31, 2018 6:00 PM