I'm trying to  compute the product of all elements in a given array

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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I'm trying to  compute the product of all elements in a given array using MPI c. The problem I'm having is I can't figure out how to code it porperly. I'm assuming this is what the code is

#include <stdio.h> 
#include <stdlib.h> 
#include <time.h>
#include <mpi.h> 

 int Compute_Product(int *array, int num_elements)
 {
     int product = 1;
     int i;
    
     for (i = 0; i < num_elements; i++) 
         product *= array[i];
     }

But I can't figure out how to declare the array. It's been years since I've coded and I am at my wits end

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