i log on as root with slack9.1

i compile a simple hello.c and then a simple hello.cpp(the code is correct):

/tmp#gcc -o helloc hello.c
/tmp#(no errors or warnings)

/tmp#g++ -o hello hello.cpp
/tmp#(no errors or warnings)

/tmp#helloc
/tmp#(i get nothing on X)

/tmp#hello
/tmp#(i get nothing on X)

if i am not with X running i get for both helloc,hello this:
bash- file or command not found.

But if i add a user(like "testingCompliledPrograms") and try to run
them, logged on as that user, they run.
as what the is wrong when i am root?

run with ./helloc

is there any way of deactivating that when i am logged on as root? or it is set like that for safety and security reasons ?

Just add the current working directory (.) to your path.

It's generally not recommended to add . to your path, since you could inadvertently execute programs if you make a typo while in some arbitrary directory. Sticking with the standard /usr/bin:/usr/sbin:/bin:/sbin: etc is much safer, since your search path is static.