This video lecture explains the "difference between using operator [] and at() to access vector elements in C++".
It explains accessing elements when the index is within valid range and also explains the case when the index is out of range.
It covers exception handing in C++.
It uses onlinegdb to demonstrate.
std::vector::at
reference at (size_type n);
Access element
Returns a reference to the element at position n in the vector.
The function automatically checks whether n is within the bounds of valid elements in the vector, throwing an out_of_range exception if it is not (i.e., if n is greater than, or equal to, its size). This is in contrast with member operator[], that does not check against bounds.
https://cplusplus.com/reference/vector/vector/operator%5b%5d/
https://cplusplus.com/reference/vector/vector/at/
Program can be accessed using the below link.
https://onlinegdb.com/tTyG2H675
#cppprogramming #cpp #vector
