An example on multiplying all elements in array in Java.

Example

class MultiplyElements

{

 public static void main(String args[])

 {

 int a[]={5,8,6,2,8};

 System.out.println("The product is "+multiply(a));

 }

        public static int multiply(int a[])

        {

        int prod=1;

                for(int k:a)

                {

                prod*=k;

                }

        return prod;

        }

}

Output

The product is 3840

Analysis

prod*=k means prod=prod*k; where k represents every element in array a till the loop ends. For a better understand, the value of k at first (at the first execution of the loop) is a[0]=5 then, it is a[1]=8 and so on.

The product is 1 initially because, multiplying any number with 1 gives that number only.

The loop is executed 5 times, because there were 5 elements in the array.

prod*=k; is considered for analysis.

1=1*5; => prod=5;

5=5*8; => prod=40;

40=40*6; => prod=240;

240=240*2; => prod=480;

480=480*8; => prod=3840;

return prod; => return 3840;

Also see Subtract elements in array and add elements in array