CODEWITHSUNDEEP
java
Darius
Darius

Reputation: 7

Print the numbers and pick the right for loop

The question is: write a method that is passed an int n and returns a String that counts down from n to 1. Ex countDown(3) prints 321

My code is:

public class CountDown {
    public static void main(String[] args) {
        for(int n = n; n> 0; n--;) {
            System.out.println("i=" + i);
        }
    }
}

I'm a beginner at coding but I'm not sure how to fix this. I believe my for loop is wrong.

Upvotes: 1

Views: 69

Answers (2)

Picachieu
Picachieu

Reputation: 3782

The variable you declared in your for loop (n) is different than the one you printed (i), and you are assigning n to n when it is declared. You need to do this in order to make it work:

  • Either change the value of the variable in your for loop from n to i or print out n instead of i

  • Change the declaration of the variable to not assign it to itself

Here is one way:

public class CountDown {
    public static void main(String[] args) {
        for(int i = 5; i > 0; i--;) {
            System.out.println("i=" + i);
        }
    }
}

This will be the output:

i=5
i=4
i=3
i=2
i=1

Upvotes: 0

Karol Dowbecki
Karol Dowbecki

Reputation: 44952

In your current attempt you haven't declared n variable and then re-declared it inside the for loop which is not allowed.

You should declare a new countDown(int) method and then use either while or for loop. It could look like:

public static void main(String[] args) {
  System.out.println(countDown(3));
}

private static String countDown(int n) {
  StringBuilder builder = new StringBuilder();
  while (n > 0) {
    builder.append(n);
    n--;
  }
  return builder.toString();
}

Upvotes: 2

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