G++ execution Problem but compiles successfully

Question

Hello Friends, can anybody explain me what is the error in this procedure of compiling and executing a c++ program file.

Answer 1

If you haven't specified the name of the executable to produce with -o NAME, it will be called a.out, rather than the same name as the source file.

So either do:

g++ program.cpp -o program
./program

or

g++ program.cpp
./a.out