How do i change the if statement to iterate backwards through the array?

Question

How do I iterate backwards through the array? What do I need to do to the for statement?

public static void main(String args[])
{
    int a[] = {0, 1, 2, 3};
    for (int i=1; i<=a.length; i++)
    {
        System.out.println("a[i] = " + a[i]); 
    }
}

i assume you mean for statement. start from the back till i>=0 and decrement counter — Sanjeev, Oct 04 '16 at 06:33
If you mean the 'for' statement, you just need to change that to `for (int i=a.length - 1; i >=0; i--)` — Invisible Arrow, Oct 04 '16 at 06:33
Possible duplicate of [Looping through the elements in a array backwards](http://stackoverflow.com/questions/9379489/looping-through-the-elements-in-a-array-backwards) — Julien Lopez, Oct 04 '16 at 07:52

score 3 · Answer 1 · answered Oct 04 '16 at 06:34

In case it about traversing the array backwards you can do like this

public static void main(String args[])
    {
        int a[] = {0, 1, 2, 3};
        for (int i=a.length -1 ; i>=0; i--)
        {
            System.out.println("a[i] = " + a[i]); 
        }
    }
}

Output

a[i] = 3
a[i] = 2
a[i] = 1
a[i] = 0

score 1 · Answer 2 · answered Oct 04 '16 at 06:33

1

Start from the length minus one and go back to zero

for (int i = a.length -1; a >= 0; i--)
{
    System.out.println("a[i] = " + a[i]); 
}

answered Oct 04 '16 at 06:33

Scary Wombat

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How do i change the if statement to iterate backwards through the array?

2 Answers2