how to run cpp file
# Open Terminal: 
# Type: 
g++ --version
# If the command is not recognized: 
sudo apt-get install g++ 
g++ --version # should work now 
# If the command is recognized
mkdir tmp 
cd tmp 
touch main.cpp 
# open main.cpp using vi, vim, gedit, etc
# Type in a hello world program: 
# https://www.tutorialspoint.com/cplusplus-hello-world-program
# Once this has been done, type in: 
g++ main.cpp
./a.out