You need to copy the files from your location to the destination ~pdslab/2015/assign2/cs15XX. Here cs15XX is your roll no.
File naming convention and destination should be as we have mentioned. Remember to give read access rights on your source
(program) files before uploading them.

We assume that you have created a directory 'pdslab' in your account, under it you have created a directory for Assignment 2
named 'assign2', and have created the C program files as 'cs15XX-assign2-prog1.c' and 'cs15XX-assign2-prog2.c'.

Assuming the above mentioned structure, copy the final program files to the destination folder '~pdslab/2015/assign2/cs15XX'
as follows: 

cp ~/pdslab/assign2/cs15XX-assign2-prog1.c ~pdslab/2015/assign2/cs15XX/cs15XX-assign2-prog1.c
cp ~/pdslab/assign2/cs15XX-assign2-prog2.c ~pdslab/2015/assign2/cs15XX/cs15XX-assign2-prog2.c