Check if All elements of Array are equal in C++
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Check if All elements of Array are equal in C++
This tutorial will discuss about a unique way to check if all elements in array are equal in C++.
To check if all elements of an array or equal, we will use the STL algorithm std::adjacent_find().
The std::adjacent_find() function accepts 3 arguments,
- Iterator pointing to the start of a sequence.
- Iterator pointing to the end of his sequence
- One callback function which accepts 2 values as arguments and return true if both the values are not equal.
For every ith element in the array, the std::adjacent_find() function will call the std::not_equal_to<int>() function and pass the element at index i & (i+1). If both are not equal, then the function std::not_equal_to<int>() returns true.
So, std::adjacent_find() will return an iterator pointing to the first element that is differet. Then we can compare the return iterator with a pointer pointing to the end of array to check if all elements in array are equal or not.
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It returned iterator points to the end of array, then it means all elements in array are equal.
Let’s see the complete example,
#include <iostream>
#include <algorithm>
int main()
{
int arr[] = { 33, 33, 33, 33, 33, 33 };
// Get the size of array
size_t len = sizeof(arr)/sizeof(arr[0]);
// Get iterator pointing to the first element
// that is not equal to its next element
auto it = std::adjacent_find(arr,
arr + len,
std::not_equal_to<int>());
// check if iterator points to the end of array
if (it == arr + len)
{
std::cout << "Yes, all elements in the array are equal." << std::endl;
}
else
{
std::cout << "No, all elements in the array are not equal." << std::endl;
}
return 0;
}
Output :
Yes, all elements in the array are equal.
Summary
Today we learned about several ways to check if all elements in array are equal in C++. Thanks.
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