/tmp/ccNKKJMa.o: In function `main':
ex2.cpp:(.text+0x0): multiple definition of `main'
/tmp/cc0Olcws.o:Bus.cpp:(.text+0x0): first defined here
/tmp/cc0Olcws.o: In function `main':
Bus.cpp:(.text+0x38): undefined reference to `Bus::Bus(int)'
Bus.cpp:(.text+0xc6): undefined reference to `Bus::print()'
Bus.cpp:(.text+0x106): undefined reference to `Bus::passengerGetOn(int)'
Bus.cpp:(.text+0x14a): undefined reference to `Bus::passengerGetOff(int)'
/tmp/ccNKKJMa.o: In function `main':
ex2.cpp:(.text+0x38): undefined reference to `Bus::Bus(int)'
ex2.cpp:(.text+0xc6): undefined reference to `Bus::print()'
ex2.cpp:(.text+0x106): undefined reference to `Bus::passengerGetOn(int)'
ex2.cpp:(.text+0x14a): undefined reference to `Bus::passengerGetOff(int)'
collect2: error: ld returned 1 exit status