merger
Merge branch 'master' of git://github.com/kalvinnchau/cse131
Merge branch 'master' of git://github.com/kalvinnchau/cse131
Merge branch 'master' of git://github.com/kalvinnchau/cse131
Merge branch 'master' of git://github.com/kalvinnchau/cse131
check 17 beginning for  == and != checks for ptrs