How to setting gcc and g++ symbolic link for any version of install on Ubuntu 18.04

How to setting gcc and g++ symbolic link for any version of install on Ubuntu 18.04

1. delete /usr/bin/ gcc and g++

$ cd /usr/bin

$ sudo rm gcc g++

2. do symbolic link for gcc-7 and g++-7

$ sudo ln -s gcc-7 gcc

$ sudo ln -s g++-7 g++

that's it.