Answer 1

GCC, also called GNU Compiler Collection, is like the name says, a compiler suite. It offers a C/C++ compiler to compile written code. G++ is a C++ compiler from the GCC. So G++ is part of GCC, so they can't be a difference. Microsoft Visual C++ is a C++ compiler from Microsoft. Note that Visual C++ is Windows only while GCC is open-source and cross-platform. Also Visual C++-compiled code can only be executed on a Windows Mashine, GCC compiled on all available platforms.