How to get the last element of an array in C++
In this tutorial, we are going to learn about how to get the last element of an array in C++.
Consider, we have the following array.
array<int,4> arr {20, 30, 40, 50};
Now, we want to get the last element 50
from the above array.
To get the last element (50) from the array, we can use the std::array::back()
function in C++.
The std::array::back() function is defined inside the array.h header file.
Here is an example:
#include <iostream>
#include <array>
using namespace std;
int main()
{
array<int,4> arr {20, 30, 40, 50};
int lastElement = arr.back();
cout<<"last element is: "<<lastElement<<endl;
return 0;
}
Output:
50
Similarly, we can also get the last element of an array by using the subscript operator []
with last element index.
In C++ arrays are zero-indexed. The first element index is
0
, to get the last element index we need to subtract thearray.size()-1
, becausesize()
function returns the total number of elements from an array.
Example:
#include <iostream>
#include <array>
using namespace std;
int main()
{
array<int,4> arr {20, 30, 40, 50};
int lastElement = arr[arr.size()-1];
cout<<"last element is: "<<lastElement<<endl;
return 0;
}