Headers function

Question 1

Vector- size()

Answer 1

Return number of items (unsigned integral type)

Time complexity: O(1)

Question 2

Vector - capacity()

Answer 2

Return number of items it can hold (unsigned integral type)

Time complexity: O(1)

Question 3

Vector - empty()

Answer 3

Return true or false (boolean)

Time complexity: O(1)

Question 4

Vector - at(index)

Answer 4

Return a reference to the element at index
Exception out_of_range will throw if out of bound

Time complexity: O(1)

Question 5

Vector - push_back(item)

Answer 5

Add item to the end of the vector

Time complexity: O(1)

Question 6

Vector- insert(iterator position,{(item) or (n, item)or (input iterator first, input iterator last)})

Answer 6

Insert item to the given position
Insert n items to the given position
Insert the given item in range to the given position

Time complexity: O(n+m) where n is the number of item insets and m is the elements moved

Question 7

Vector - pop_back()

Answer 7

Remove the last element from the vector

Time complexity: O(1)

Question 8

Vector - begin()

Answer 8

Return an iterator pointing to the first element

Time complexity: O(1)

Question 9

Vector - back()

Answer 9

Return a reference to the last element

Time complexity: O(1)

Question 10

Vector - front ()

Answer 10

Return a reference to the first element

Time complexity: O(1)

Question 11

Vector - end()

Answer 11

Return an iterator pointing to the last element

Time complexity: O(1)

Question 12

Cassert - assert(expression)

Answer 12

Terminates the program if expression = 0 / false

Question 13

cctype - isalnum(char)

overloaded functions in locale

Answer 13

Return true if given char is an alphanumeric character
False otherwise

Alphanumeric character = decimal digit / uppercase and lowercase letter

Question 14

cmath - cbrt(double)

Answer 14

Return cubic root of the given number