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How to programming with vi?

I having a problem while doing programming with vi. After I entered all the source codes, how do I save it and debug ??
It said :w is to save
:q is exit
But when I entered both nothing happen....

Please tell me step by step.Thanks

:wq

together is the command to write and quit mate

how do I debug it? what command?

once its save cant you debug with gcc??

Code:

5.3 Debugger gdb 

You would be using gdb extensively along with Vi. Debugging is the most important aspect of programming as the major cost of software projects goes into debugging and testing. 



To debug C++/C programs use 'gdb' tool. See 'man gdb'. You must compile your programs with -g3 option like 



        gcc -g3 foo.c foo_another.c sample.c



To set up easy aliases do - 



  Setup an alias in your ~/.bash_profile

        alias gdb='gdb -directory=/home/src -directory=/usr/myname/src '

  Give -

        gdb foo.cpp

        gdb> dir /hom2/another_src

        This will add to file search path

        gdb> break 'some_class::func<TAB><TAB>

  This will complete the function name saving you typing time... and will output like -

        gdb> break 'some_class::function_foo_some_where(int aa, float bb)'



Pressing TAB key twice is the command line completion, which will save you lots of typing time. This is one of the most important technique of using gdb.

Reference;

http://www.cs.auckland.ac.nz/referen...m-HOWTO-5.html

Hi,

Vi (vim, actually) is 'just' an editor. There's no standard feature that debug's program X's code.

You can extend Vim to include such a feature. Create your own code snippet to do just that (or go on-line and search for one). Here's one that compiles gcc code and runs it, while still inside vim:

Code:

" -----------------------------------------------------------------------------

" Compile (gcc) and run written code

map <F4> :call CompileRunGcc()<CR>

func! CompileRunGcc()

  exec "w"

  exec "!gcc % -o %<"

  exec "! ./%<"

endfunc

Add the above to your .vimrc and, using the F4 function key, your code is compiled and run (or errormessages appear and it won't run :) ).

This will only compile the gcc code when pressing F3:

Code:

" -----------------------------------------------------------------------------

" Compile (gcc) written code

map <F3> : call CompileGcc()<CR>

func! CompileGcc()

  exec "w" 

  exec "!gcc % -o %<"

endfunc

In general people will exit vim (or open a second terminal / use ctrl-z), run the program (after saving it) see what goes wrong, go back to vim, change code etc etc.

Depending on the language you are programming in and how often you program you could start looking for a specialized editor for that specific language. But vim will do nicely most of the time.

Personally I do all my programming in vim.

Hope this clears things up a bit.

Use emacs :D ...

I just prefer emacs over vi but that's only my opinnion. It's 'easier' to use than vi.

But you should check some online information about vi so you know what it's capable of so you can alter it to your preferences.

Well actually vi and vim are in different formats so it just depends on what format you like better. And for the commands
press escape twice to get out of input mode then shift and zz at the same time to exit to main and save. To compile use gcc then to run the program use a.out.

Actually, in vi & vim (vim = vi improved, so vi + extra capabilities) the cmds are

:w - write to disk
:q - quit, no changes saved
:x - exit+save changes

and many many more; google vi or vim cheatsheet.