array::at() in C++ STL
Array classes are generally more efficient, light-weight and reliable than C-style arrays. The introduction of array class from C++11 has offered a better alternative for C-style arrays.
This function is used to return the reference to the element present at the position given as the parameter to the function.
array_name.at(position) Parameters: Position of the element to be fetched.
Return: It return the reference to the element at the given position.
Input: array_name1 = [1, 2, 3] array_name1.at(2); Output: 3 Input: array_name2 = ['a', 'b', 'c', 'd', 'e'] array_name2.at(4); Output: e
Element present at position 2: 3 Element present at position 4: e
Time Complexity: Constant i.e. O(1).
Given an array of integers, print integers in alternate fashion starting from 1st position.
Input: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Output: 2 4 6 8 10
2 4 6 8 10