New User and how to use octave in c code ?

[Progressive]

Hi,

I'm glad I stumbled over octave as it looks very promising. Just wanted to
do my first steps by including octave into my c++ code but it does not work.
Sorry for the very general question, actually I'm facing too many
impressions..

By starting octave in shell through "$ octave" I receive the following:

"Octave Critical Error
The settings file /home/ben/.config/octave/qt-settings does not exist and
can not be created.
Make sure you have read and write permissions to /home/ben/.config/octave

Octave GUI must be closed now"

Hence, as mentioned on
https://www.gnu.org/software/octave/doc/v4.0.3/Standalone-Programs.html#Standalone-Programs
by using 

#include <iostream>
#include <octave/oct.h>

it in a code I get

"/home/ben/analysis/analyse_tree/Filter/Filter.cxx:2:10: fatal error:
'octave/oct.h' file not found
#include <octave/oct.h>
         ^
Warning in <TInterpreter::TCling::RegisterModule>: Problems in compiling
forward declarations for module libGraf3d: '
#line 1 "libGraf3d dictionary forward declarations' payload"
#pragma clang diagnostic ignored "-Wkeyword-compat"
#pragma clang diagnostic ignored "-Wignored-attributes"
#pragma clang diagnostic ignored "-Wreturn-type-c-linkage""

According to my ubuntu software center it is installed successfully in
/usr/share/octave
Version is 4.0.2

Can anyone please help ? Thank you very much in advance!



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