Check if All elements in Array are equal to value in C++
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Check if All elements in Array are equal to value in C++
This tutorial will discuss about a unique way to check if all elements in array are equal to value in C++.
To check if all elements of array matches with a given value, we are going to use the STL algorithm std::all_of().
Inside STL algorithm std::all_of() we will pass 3 arguments,
- Pointer pointing to the start of array.
- Pointer pointing to the end of array
- A Lambda function, which accepts an element as an argument and returns true if the given element is equal to a given value.
The std::all_of() function will apply the given Lambda function on all the elements of the array. If for all the elements the lambda function returns true, then the std::all_of() function will return true.
If there is a single element in array that is not equal to the given value, then the std::all_of() function returns false.
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Like, in the below example we will check if all the elements of array are equal to value 15.
Let’s see the complete example,
#include <iostream>
#include <algorithm>
int main()
{
int arr[] = { 15, 15, 15, 15, 15 };
int value = 15;
// Get the size of array
size_t len = sizeof(arr)/sizeof(arr[0]);
// Check if all elements of array arr are equal to a value
bool result = std::all_of(arr,
arr + len,
[&value](bool elem){
return elem == value;
});
if (result)
{
std::cout << "Yes, all elements of array are equal to 15." << std::endl;
}
else
{
std::cout << "No, all elements of array are not equal to 15." << std::endl;
}
return 0;
}
Output :
No, all elements of array are not equal to 15.
Summary
Today we learned about several ways to check if all elements in array are equal to value in C++. Thanks.
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