I have some question about compiling .cpp inside a folder, it says

first.cpp No such file or directory

but when I run it in home it compiles. Any settings I might have left out? Thanks.

Here's the Terminal output (view it bigger):

law@ubuntu:~$ ls

android-sdk   Downloads         Pictures        test        wallpapers

android-sdks  eclipse           Public          tomcat      workspace

Desktop       examples.desktop  sourcecodescpp  Ubuntu One

Documents     Music             Templates       Videos

law@ubuntu:~$ dir sourcecodescpp

first.cpp

law@ubuntu:~$ g++ first.cpp

g++: error: first.cpp: No such file or directory

g++: fatal error: no input files

compilation terminated.

law@ubuntu:~$ ./a/out

bash: ./a/out: No such file or directory

law@ubuntu:~$ ls

android-sdk   Downloads         Pictures        test        wallpapers

android-sdks  eclipse           Public          tomcat      workspace

Desktop       examples.desktop  sourcecodescpp  Ubuntu One

Documents     Music             Templates       Videos

law@ubuntu:~$ dir ls

dir: cannot access ls: No such file or directory

law@ubuntu:~$ ls

android-sdk   Downloads         Music           Templates   Videos

android-sdks  eclipse           Pictures        test        wallpapers

Desktop       examples.desktop  Public          tomcat      workspace

Documents     first.cpp         sourcecodescpp  Ubuntu One

law@ubuntu:~$ g++ first.cpp

law@ubuntu:~$ ./a.out

Hello World!law@ubuntu:~$ ^C

law@ubuntu:~$ ^C

law@ubuntu:~$