Added short answers, basic/unfinished implementations of exit and write in syscall.c
Merge branch 'JohnBranch' of github.com:JQGuo/cs350-os161 into JohnBranch
Implemented argument passing(Somewhat tested).
All system calls implemented fully except for waitpid, exit and fork. May be potential changes to file in order to prepare for fork.
Attempt to merge.
Attempt to commit to master.