chapter 11 exercise 11-5: instrument Student_info and see how many instances are created, assigned, copied, destroyed when seperation

two pass results:
begin seperating 8860 students
end:7585 passed,1275 failed
0 instances created
3322 instances copied : 1275 failed +
4295 instances assigned : 4295 after
3322 instances destroyed : 1275 failed +

single pass results:
begin seperating 8860 students
end:7585 passed,1275 failed
0 instances created
10135 instances copied
6845 instances assigned
10135 instances destroyed