// A program to demonstrate a simple array being read
// through and printing out the elements of that array
// Sasha Week 3 Lecture 6

// Let's say I want an array with the values 1, 3, 4, 5, 9, 10, 11
// Let's do some functions:
// 1. Calculate the product of these numbers 
// 2. Calculate average of these numbers
// 3. Calculate the sum of these numbers
// 4. Count the multiples of 3

#include <stdio.h>

#define MAX_ARRAY 7

void print_array(int array[MAX_ARRAY]);
int product_array(int array[MAX_ARRAY]);
int average_array(int array[MAX_ARRAY]);
void multiple_three(int array[MAX_ARRAY]);

int main (void) {
    //int a = 1;
    //int b = 3;
    //int c = 4;
    //int product = 1;
    //int sum = 0;

    // 1. Declare and initialise the array that you will use here
    int array[MAX_ARRAY] = {1, 3, 4, 5, 9, 10, 11};

    // Traverse through the array and print out the elements of the array
    /*int i = 0;
    while (i < MAX_ARRAY) {
        printf("%d ", array[i]);
        i++;
    }*/

    /*for(int i = 0; i < MAX_ARRAY; i++){
        printf("%d ", array[i]);
    }
    printf("\n");
    */
    print_array(array);

    // Traverse through the array and multiply the numbers together 
    /*for (int i = 0; i < MAX_ARRAY; i++) {
        product = product * array[i];
    }
    */
    
    
    // Output the result (product of numbers)
    printf("The product of the numbers is %d\n", product_array(array));

    // Calculate average of these numbers
    /*for (int i = 0; i < MAX_ARRAY; i++) {
        sum = sum + array[i];
    }
    int average = sum / MAX_ARRAY;
    */
    printf("The average of the numbers is %d\n", average_array(array));
    
    // Calculate the sum of these numbers
    // printf("The sum of the numbers is %d\n", sum);

    // Count the multiples of 3
    // printf("The number of multiples of 3 is %d\n", multiples);
    multiple_three(array);
    
    return 0;
}

// This function will print out the array
// OUTPUT: void  
// INPUT: an array
// Name: print_array
void print_array(int array[MAX_ARRAY]) {
    for(int i = 0; i < MAX_ARRAY; i++){
        printf("%d ", array[i]);
    }
    printf("\n");
}


// This function will print out the product of array numbers
// OUTPUT: product (int) 
// INPUT: array
// Name: product_array
int product_array(int array[MAX_ARRAY]) {
    int product = 1;

    for (int i = 0; i < MAX_ARRAY; i++) {
        product = product * array[i];
    }
    return product;
}

// This function will print out the average of the array numbers
// OUTPUT: int 
// INPUT: array
// Name: average_array
int average_array(int array[MAX_ARRAY]) {
    int sum = 0;
    for (int i = 0; i < MAX_ARRAY; i++) {
        sum = sum + array[i];
    }
    int average = sum / MAX_ARRAY;
    return average;
}


// This function will print out the sum of the array numbers
// OUTPUT:  
// INPUT: 
// Name: 

// This function will print out the multiples of 3 in the array
// OUTPUT: void  
// INPUT: array
// Name: multiple_three
void multiple_three(int array[MAX_ARRAY]) {
    // Check if a number in the array / 3, if yes print it out
    for(int i = 0; i < MAX_ARRAY; i++) {
        if (array[i] % 3 == 0){
            printf("%d ", array[i]);
        }
    }
}