Java program to count number of even and odd elements in an array | Basic DSA | Direct Coding | смотреть онлайн

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For the given array of integers, count even and odd elements.

Examples:

Input:
int arr[5] = {2, 3, 4, 5, 6}
Output:
Number of even elements = 3
Number of odd elements = 2

Input:
int arr[5] = {22, 32, 42, 52, 62}
Output:
Number of even elements = 5
Number of odd elements = 0
Solution: We can also check if a number is odd or even

By doing AND of 1 and that digit, if the result comes out to be 1 then the number is odd otherwise even.
By its divisibility by 2. A number is said to be odd if it is not divisible by 2, otherwise its even.
Here, we will check if a number is odd, then we will increment the odd counter otherwise we will increment the even counter.

Time Complexity: O(n)
Auxiliary Space: O(1) because it is using constant space for variables