C++ <array> - operator== Function

The C++ <array> operator== function is used to check whether two arrays are equal or not. It returns true if two arrays are equal, else returns false. operator== compares elements of arrays sequentially and stops comparison after first mismatch.

Syntax

• C++11

template <class T, size_T N>
bool operator== (const array<T,N>& lhs, const array<T,N>& rhs);

Parameters

Return Value

Returns true if the contents of lhs are equal to the contents of rhs, else returns false.

Time Complexity

Linear i.e, Θ(n).

Example:

In the example below, the operator== function is used to check whether two arrays are equal or not.

#include <iostream>
#include <array>
using namespace std;
 
int main (){
  array<int, 3> arr1 {10, 20, 30};
  array<int, 3> arr2 {10, 20, 30};
  array<int, 3> arr3 {20, 30, 40};

  if (arr1 == arr2)
    cout<<"arr1 and arr2 are equal.\n";
  else
    cout<<"arr1 and arr2 are not equal.\n";

  if (arr1 == arr3)
    cout<<"arr1 and arr3 are equal.\n";
  else
    cout<<"arr1 and arr3 are not equal.\n";
    
  return 0;
}

The output of the above code will be:

arr1 and arr2 are equal.
arr1 and arr3 are not equal.