Array class in C++

Array class in C++ are efficient enough and also it knows its own size.

Functions used to perform operations on array are

• size() = To return the size of array i.e. returns the no of elements of the array.
• max_size() = To return maximum number of elements of the array.
• get(), at(), operator[] = To get access of the array elements.
• front() = To return front element of the array.
• back() = To return last element of the array.
• empty() = Returns true if array size is true otherwise false.
• fill() = To fill the entire array with a particular value.
• swap() = To swap the elements of one array to another.

Here is an example to implements all the operations as mentioned above −

Example Code

#include<iostream>
#include<array>
using namespace std;

int main() {
   array<int,4>a = {10, 20, 30, 40};
   array<int,4>a1 = {50, 60, 70, 90};
   cout << "The size of array is : ";
   //size of the array using size()
   cout << a.size() << endl;
   //maximum no of elements of the array
   cout << "Maximum elements array can hold is : ";
   cout << a.max_size() << endl;
   // Printing array elements using at()
   cout << "The array elements are (using at()) : ";
   for ( int i=0; i<4; i++)
      cout << a.at(i) << " ";
      cout << endl;
   // Printing array elements using get()
   cout << "The array elements are (using get()) : ";
   cout << get<0>(a) << " " << get<1>(a) << " "<<endl;
   cout << "The array elements are (using operator[]) : ";
   for ( int i=0; i<4; i++)
      cout << a[i] << " ";
      cout << endl;
   // Printing first element of array
   cout << "First element of array is : ";
   cout << a.front() << endl;
   // Printing last element of array
   cout << "Last element of array is : ";
   cout << a.back() << endl;
   cout << "The second array elements before swapping are : ";
   for (int i=0; i<4; i++)
      cout << a1[i] << " ";
      cout << endl;
   // Swapping a1 values with a
   a.swap(a1);
   // Printing 1st and 2nd array after swapping
   cout << "The first array elements after swapping are : ";
   for (int i=0; i<4; i++)
      cout << a[i] << " ";
      cout << endl;
      cout << "The second array elements after swapping are : ";
   for (int i = 0; i<4; i++)
      cout << a1[i] << " ";
      cout << endl;
   // Checking if it is empty
   a1.empty()? cout << "Array is empty":
   cout << "Array is not empty";
   cout << endl;
   // Filling array with 1
   a.fill(1);
   // Displaying array after filling
   cout << "Array content after filling operation is : ";
   for ( int i = 0; i<4; i++)
      cout << a[i] << " ";
      return 0;
}

Output

The size of array is : 4
Maximum elements array can hold is : 4
The array elements are (using at()) : 10 20 30 40
The array elements are (using get()) : 10 20
The array elements are (using operator[]) : 10 20 30 40
First element of array is : 10
Last element of array is : 40
The second array elements before swapping are : 50 60 70 90
The first array elements after swapping are : 50 60 70 90
The second array elements after swapping are : 10 20 30 40
Array is not empty
Array content after filling operation is : 1 1 1 1