C Program for Product of Array

Given an array arr[n] of n number of elements, the task is to find the product of all the elements of that array.

Like we have an array arr[7] of 7 elements so its product will be like

Example

Input: arr[] = { 10, 20, 3, 4, 8 }
Output: 19200
Explanation: 10 x 20 x 3 x 4 x 8 = 19200
Input: arr[] = { 1, 2, 3, 4, 3, 2, 1 }
Output: 144

The approach used below is as follows −

• Take array input.
• Find its size.
• Iterate the array and Multiply each element of that array
• Show result

Algorithm

Start
In function int prod_mat(int arr[], int n)
   Step 1-> Declare and initialize result = 1
   Step 2-> Loop for i = 0 and i < n and i++
      result = result * arr[i];
   Step 3-> Return result
int main()
   Step 1-> Declare an array arr[]
   step 2-> Declare a variable for size of array
   Step 3-> Print the result

Example

 Live Demo

#include <stdio.h>
int prod_arr(int arr[], int n) {
   int result = 1;
   //Wil multiply each element and store it in result
   for (int i = 0; i < n; i++)
   result = result * arr[i];
   return result;
}
int main() {
   int arr[] = { 10, 20, 3, 4, 8 };
   int n = sizeof(arr) / sizeof(arr[0]);
   printf("%d", prod_arr(arr, n));
   return 0;
}

Output

If run the above code it will generate the following output −

19200