C++ Exercises: Count even number of elements in a given array of integers

Last update on December 20 2024 12:28:44 (UTC/GMT +8 hours)

Count Even Numbers in Array

Write a C++ program to count the even number of elements in a given array of integers.

Sample Solution:

C++ Code :

#include <iostream>  // Including input-output stream header file

using namespace std;  // Using standard namespace

// Function definition that counts the number of even integers in the input array
static int test(int nums[], int arr_length)
{
    int evens = 0;  // Initializing a counter for even numbers

    // Loop through the array to count even numbers
    for (int i = 0; i < arr_length; i++)
    {
        if (nums[i] % 2 == 0)  // Checking if the element is even
            evens++;  // Incrementing the counter if the number is even
    }

    return evens;  // Returning the count of even numbers
}

int main() 
{  
    int nums1[] = {1, 5, 7, 9, 10, 12};  // Initializing array nums1 with various integers
    int arr_length = sizeof(nums1) / sizeof(nums1[0]);  // Calculating length of array nums1

    // Calling test function with nums1 and displaying the count of even numbers
    cout << test(nums1, arr_length) << endl; 

    int nums2[] = {0, 2, 4, 6, 8, 10};  // Initializing array nums2 with even integers
    arr_length = sizeof(nums2) / sizeof(nums2[0]);  // Calculating length of array nums2

    // Calling test function with nums2 and displaying the count of even numbers
    cout << test(nums2, arr_length) << endl;  

    return 0;  // Returning 0 to indicate successful completion of the program
}

Sample Output:

2
6

Visual Presentation:

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