finish the first problem of "Inspect"
figured the etext, edata, and end
finish the 2nd instect problem: printsegaddress
finish 3.3(mostly, still need to update) and 3.4
finish 3 and 4 part of problem 3 inspect xxx
finish problem 4 -- memory layout diagrams
finish problem 5
finish question 5 and 6 in the pdf
add some comments according to class notes
Merge branch 'lab1'