Question

Which of the following(s) can be used to access the first element of a vector v?

(a) v.begin()

(b) v.cbegin()

(c) v[0]

(d) all of the mentioned

I got this question in a job interview.

Query is from seq_con Vector Class in portion Class Hierarchies, Library & Containers of C++

Answer 1

Correct option is (d) all of the mentioned

The best explanation: To access the first element of a vector we can use the following things:

i) v.begin()

ii) v.cbegin()

iii) v[0]

iv) v.at(0)