In what case should I use gcc compiler instead of g++

[sylvain]

My book tells me that g++ is part of gcc. What compiler is the best for C++ and Qt ??

[helios]

g++ and gcc are part of the GCC (GNU Compiler Collection). g++ and gcc are, respectively, the C++ and C compilers of the GCC.
Use g++ if you're writing C++ and use gcc if you're writing C.