no i am a beginner.
the code is #include<Random1.h>
if i change <Random1.h> to "Random1.h", it works.
the book say this is directory problem. how can i fix it instead of change the code to "Random1.h".
thanks, i have find the place for the include directory and it works. however there is another problem. it is initially for the boost library. now i change it to my <Random1.h> file, so how about the boost.