The default file name for the executable program is a.out. You can select a different name with the -o compiler option. You should avoid giving your programs the same names as system or shell commands (such as test or cp), as you could accidentally execute the wrong command. If a name conflict does occur, you can execute the program by specifying a path name, such as ./test.
You can run a program by entering the path name and file name of an executable file along with any runtime arguments on the command line.