#include <stdio.h>

/**
 * Simple function to calculate the sum of an array
 * @param arr Pointer to the array
 * @param size Size of the array
 * @return Sum of array elements
 */
int array_sum(int* arr, int size) {
    int sum = 0;
    for (int i = 0; i < size; i++) {
        sum += arr[i];
    }
    return sum;
}

/**
 * Function to find the maximum value in an array
 * @param arr Pointer to the array
 * @param size Size of the array
 * @return Maximum value in the array
 */
int find_max(int* arr, int size) {
    if (size <= 0) {
        return 0;
    }

    int max = arr[0];
    for (int i = 1; i < size; i++) {
        if (arr[i] > max) {
            max = arr[i];
        }
    }
    return max;
}

/**
 * Simple arithmetic operations function
 * @param a First operand
 * @param b Second operand
 * @return Result of a * b + a
 */
int arithmetic_ops(int a, int b) {
    int product = a * b;
    int result = product + a;
    return result;
}

/**
 * Pointer manipulation function
 * @param ptr Pointer to integer
 * @param value Value to set
 * @return The value that was set
 */
int pointer_ops(int* ptr, int value) {
    if (ptr != NULL) {
        *ptr = value;
    }
    return value;
}

int main() {
    int test_array[] = {1, 2, 3, 4, 5};
    int size = 5;

    int sum = array_sum(test_array, size);
    int max = find_max(test_array, size);
    int result = arithmetic_ops(2, 3);

    int x = 0;
    pointer_ops(&x, 42);

    printf("Sum: %d, Max: %d, Result: %d, X: %d\n", sum, max, result, x);

    return 0;
}