m.cpp:1:2: error: invalid preprocessing directive #!
1 | #!/usr/bin/vim
Please do favor solve it, thanks so much
The `#` is not a valid comment in C++, and `#!` is not a valid preprocessor directive, hence the error.
g++ X.cc ...
and such that this file is a hash bang script.C and C++ can be hash-bang scripted, through a shell script which cuts out the incompatible material and feeds the rest to the compiler. See the solution for the multiline shebang task in Rosetta Code:
https://rosettacode.org/wiki/Multiline_shebang#C
I'm guess you're trying to make the program self-editing rather than self executing, by using Vim as the interpreter?