how to delete unstaged files that were recently added locally

C++
# Print out the list of files which will be removed (dry run)
git clean -n

# Interactive and you will get a quick overview of what is 
# going to be deleted offering you the possibility to include/exclude 
# the affected files
git clean -i

# To remove files, run
git clean -f

# To remove directories, run 
git clean -fd

# To remove ignored files, run 
git clean -fX

# To remove ignored and non-ignored files, run 
git clean -fxgit clean -fdxgit clean -ngit clean -fTo see what files will be removed:
git clean -n <optional file_name/dir>

To actually delete those files:
git clean -f <optional file_name/dir>
Source

Also in C++: