C++ Exercises: Compute the difference between the largest and smallest values in a given array of integers and length one or more

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

using namespace std;  // Using standard namespace

// Function definition that calculates the difference between the largest and smallest integers in an array
static int test(int nums[], int arr_length)
{
    int small_num = 0, biggest_num = 0;  // Initializing variables to store smallest and biggest numbers

    // Checking if the array has at least one element
    if (arr_length > 0)
        small_num = biggest_num = nums[0];  // Setting the first element as both the smallest and biggest number initially

    // Loop through the array to find the smallest and biggest numbers
    for (int i = 1; i < arr_length; i++)
    {
        small_num = min(small_num, nums[i]);  // Updating small_num if a smaller number is found
        biggest_num = max(biggest_num, nums[i]);  // Updating biggest_num if a larger number is found
    }

    return biggest_num - small_num;  // Returning the difference between the largest and smallest 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 difference between largest and smallest 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 difference between largest and smallest numbers
    cout << test(nums2, arr_length) << endl;  

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