Bug : C++ compiler doesn't seem to work on linux env, provides erroneous output

The app hosted on _ec2 instance **(ubuntu os)** doesn't run for C++, it runs fine if project is setup on **windows machine** in dev mode. Investigate the issue and possibly fix the code to make it platform agnostic.

#### Steps to reproduce the issue :

1. Go to http://15.207.254.114/
2. Select language as C++ from the dropdown
3. Use the default code or provide your own C++ code and then submit to check output