Four Common Problems in program development

Four Common Problems in program development-general Linux technology-Linux programming and kernel information. For details, refer to the following section. 0001
Debug core files in linux
Gdb
: Executable program that generates core dump due to an error.
: Name of the core dump file. The default value is "core"


0002
A. out obtained by gcc abc. c cannot be run.
./A. out

0003
Why is the error message "cout" not defined during c ++ compilation?
Add using namespace std after the include header file;

0004
The standard connection libraries used by the newly compiled gcc are all under/usr/local/lib, but how to add the default connection paths/usr/lib? (Except for adding-L/usr/local/lib at each compilation) (sakulagi, huhuuworm)
Export LD_LIBRARY_PATH = $ LD_LIBRARY_PATH:/usr/local/lib
Write ~ /. Bash_profile.
Add a simple method:
Add/usr/local/lib to/etc/ld. so. conf and run ldconfig once.