No int causing compiling issue

[tridibsamanta]

No int causing compiling issue

[MichaeINeumann]

Hi hwangs12, I think you are right.
I learned that all C++ programs must have a main function that returns an int value.
Return 0 to execute the program normally.

I added that and created a PR.

[swarupsahu08]

Hello @hwangs12 You are correct that the programs are not executable as there is no int main() in the code base and needs to return 0 at last to run the program smoothly and can you assign me this issue so that I can make the relevant changes to the code

[hwangs12]

@MichaeINeumann @swarupsahu08 I approved Michael's PR. I will close the issue. Thanks.