Go4Expert - C++ run error...

I know I'm posting this forum twice, but I lost my original post and I didn't know there was a "Linux" forum.
When I compile my program by typing...

Code:

g++ foo.cpp

...it compiles just fine and a little happy a.out file pops up. However, when I try to run the program...

Code:

./a.out

I get an error message along the lines of...

Code:

a.out: Permission denied

I checked the permissions. They're normal: I can read, write, and execute; everyone else can read and execute; etc...
I have the same problem with Perl programs as well, but I found that when I type...

Code:

perl foo.pl

...that seems to fix the problem. I'm just concerned about C++. Do I need a package that may be corrupted? Thanks in advance.