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Credit Card Validator in C++ Hotel Management in C++ Pacman Game in C++ Billing Management System in C++ 4-Dimensional Array in C/C++ accumulate() and partial_sum() in C++ STL : Numeric header Arrays of Vectors in C++ STL Catching Base and Derived Classes as Exceptions in C++ and Java Forward List in C++ Manipulating Functions Assertions in C/C++ List back() function in C++ STL Type Inference in C++ (auto and decltype) Attributes in C++ BigInt (Big Integers) in C++ with Examples 2D Vector in C++ with User Defined Size Declare a C/C++ Function Returning Pointer to Array of Integer Pointers Jump Statements in C++ Maximum Number of Edges to be Added to a Tree so that it stays a Bipartite Graph Modulus of two Float or Double Numbers Top 10 C++ Project Ideas for Beginners C++ Class Member Functions C++ Program for Find k pairs with Smallest Sums in Two Arrays Check if bits in Range L to R of Two Numbers are Complement of Each other or Not University Management System in C++ Advantage and 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''unique_ptr'' Instances Level Order Traversal in Spiral form Problem with scanf() when there is fgets()/gets()/scanf() After it BFS Code in C++ Create Linked List In C++ Function Overloading in C++ std::minmax() and std::minmax_element() in C++ STL multimap::emplace_hint() Function in C++ STL Multimap find() in C++ STL Multiple Comparisons in a C++ Priority Queue Name Mangling and Extern C in C++ Concept Parameterised Constructor in C++ Remove Duplicates from Sorted Array in C++ Returning Multiple Values from a Function using Tuple and Pair in C++ Scope Resolution Operator vs this Pointer Set a variable without using Arithmetic, Relational or Conditional Operator C++ Program To Sort An Array In Descending Order Timsort Implementation Using C++ What Happens When We Exceed Valid Range of Built-in Data Types in C++ Naked Function Calls in C++ What is operator overloading in C++ Simple Car Racing Game Code in C++ SJF CPU Scheduling Program in C++ Virtual functions and runtime polymorphism 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Actual Parameter and Formal Parameter in C++ Adding Two Strings in C++ Adding Vectors in C++ How To Convert a Qstring to Hexadecimal in C++ PAIR IN C++ C++ Program to Count Positive and Negative Numbers in an Array Department Store Management System (DSMS) using C+ Print all Substrings of a String that has equal number of vowels and consonants in C/C++ Accumulator in C++ Acess Specifiers in C++ Add Two Matrix in C++ Add two Numbers in C++ program Add two Numbers Represented by Linked Lists in C++ Associative Containers in C++ C++ Books for Beginners Dynamic Initialization of Objects in C++ Array sum in c++ stl The distinction between the C++ copy constructor and assignment operator Boost::split in c++ library Difference between Declaration of User Defined Function Inside main() and Outside of main() Isprint() in C++ Std partition point in c++ Opening and Closing a File in C in C++ Pdf Overriding Member Function in C++ Password Validation in C++ PID Controller C++ Best C++ Online Course 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C++ Static Polymorphism in C++ Character Set in C++ Output operator in C++ Object Pointer in C++ Odd or Even Number Programs in C++ Operator Overloading in C++ Using Friend Function Ostream in C++ Kadane's Algorithm in C++ Kruskal's Algorithm in C++ Quick Sort Algorithm in C++ Abstract factory design pattern in C++ Access Class Members in C++ Adjacency List in C++ Make_pair in C++ Multiple Catch Statements in C++ Thread pool in C++ KMP Algorithm in C++ Abstract data types in C++ Bubble Sort in C++ DDA line drawing algorithm in C++ Setf() in C++ Sieve of eratosthnes in C++ Banker's Algorithm in C++ Bellman-Ford Algorithm in C++ Bubble Sort Algorithm in C++ Quick Sort Implementation in C++ Sorting Algorithms in C++ Calloc in C++ Multiplication Table in C++ Print the corner elements and their sum in a 2-D matrix in C++ Special Operators in C++ Prim's Algorithm in C++ C++ Program to display factors of a number Call by the reference in C++ Fstream in C++ How to Create a Singleton Class in 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C++ Vector at()

It gives a reference to an element.

Syntax

Consider a vector v and k is the position. Syntax would be:

vector<object_type>  v;
v.at(k) ;

Parameter

k: k defines the position of element which is to be returned by at() function.

Return value

It returns the element of specified position.

The following illustration shows how at() function works

If i=0 :

cpp vector at() function

If i=3 :

cpp vector at() function

Example

Let's see a simple example.

#include<iostream>
#include<vector>
using namespace std;
int main()
{
vector<int> v1{1,2,3,4};
for(int i=0;i<v1.size();i++)
cout<<v1.at(i);
return 0; 
}

Output:

In this example, at() function access the elements of vector .

Next TopicC++ Vector

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