C + + Primer 4.6 Practice Answers

Exercise 4.20

A) legal, dereference ITER, first output the value of the object that ITER points to, and then move the position of the ITER point forward one;

b) Illegal, *iter get a string, the string can not be self-increment;

c) Illegal, the priority of the dereference is lower than the dot operator, so the empty () function first with the ITER, ITER is a pointer to the object, he is not empty () function, should be (*iter). empty ();

d) legal, output the same value as the above question

e) legal, equivalent to + + (*iter)

f) valid, equivalent to ((iter++)). Empty (). return (ITER). Empty () results, the iterator moves back one

C + + Primer 4.6 Practice Answers