（转载）Ubuntu系统中多个版本GCC、G++并存

原文链接:
1.https://phoenixnap.com/kb/install-gcc-ubuntu#:~:text=To install the GCC compiler from Ubuntu repositories%3A,the following command to check the GCC version%3A
2.https://vegastack.com/tutorials/how-to-install-gcc-compiler-on-ubuntu-20-04/
感谢作者