Java Community | Help. Code. Learn.•15mo ago

Couldn't understand why 1<1 become true in following code?

I'm solving one of the basic recursion question from coding website. I need to assign 1 to n inside array, so platform will print the array. Here is the link of question: https://www.codingninjas.com/studio/problems/print-1-to-n_628290?leftPanelTabValue=PROBLEM Here is my solution for the platform:

public class Solution {
    public static int[] printNos(int x) {
        int[] arr = new int[x];
        recursiveFunc(arr, x);
        return arr;
    }


    public static void recursiveFunc(int[] arr, int n){
        if(n<1){
            return;
        }
        arr[n-1] = n;
        recursiveFunc(arr, n-1);
    }
}

public class Solution {
    public static int[] printNos(int x) {
        int[] arr = new int[x];
        recursiveFunc(arr, x);
        return arr;
    }


    public static void recursiveFunc(int[] arr, int n){
        if(n<1){
            return;
        }
        arr[n-1] = n;
        recursiveFunc(arr, n-1);
    }
}

And if you want to try in your IDE, you can try the following code:

package Recursion;

public class OneToN {
    public static int[] printNos(int x) {
        int[] arr = new int[x];
        recursiveFunc(arr, x);
        return arr;
    }
    public static void recursiveFunc(int[] arr, int n){
        System.out.println("Nth value: " + n);
        boolean result = n<1;
        System.out.println("n<1: " + result);
        if(n<1){
            return;
        }
        arr[n-1] = n;
        recursiveFunc(arr, n-1);
    }
}

package Recursion;

public class OneToN {
    public static int[] printNos(int x) {
        int[] arr = new int[x];
        recursiveFunc(arr, x);
        return arr;
    }
    public static void recursiveFunc(int[] arr, int n){
        System.out.println("Nth value: " + n);
        boolean result = n<1;
        System.out.println("n<1: " + result);
        if(n<1){
            return;
        }
        arr[n-1] = n;
        recursiveFunc(arr, n-1);
    }
}

Main.java:

public class Main {
        public static void main(String[] args) {
            System.out.println(Arrays.toString(OneToN.printNos(5)));
        }
    }

public class Main {
        public static void main(String[] args) {
            System.out.println(Arrays.toString(OneToN.printNos(5)));
        }
    }

8 Replies

JavaBot•15mo ago

⌛ This post has been reserved for your question.

Hey @Patel! Please use /close or the Close Post button above when your problem is solved. Please remember to follow the help guidelines. This post will be automatically closed after 300 minutes of inactivity.

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dan1st•15mo ago

1<1 won't become true but you aren't doing much with 0 why do you think it would become true?

JavaBot•15mo ago

It looks like you are having issues with debugging or issues that can be solved using a debugger. Check out this article on dev.java to see how debugging works and how to use a debugger. This Stack Overflow question and its answers also explain debugging in general. These links describe how to use the debugger in some IDEs: • Debugging in IntelliJ • Debugging in Eclipse

PatelOP•15mo ago

@dan1st | Daniel you are right, sorry for such a dumb question.

dan1st•15mo ago

using a debugger can help you find the issues if you encounter them again

PatelOP•15mo ago

Yes, I've used the debugger, still I thought why it should return false, without thinking any thing. I've made pre assumption I don't know what state in my mind was

dan1st•15mo ago

it's normal to make conceptional mistakes

JavaBot•15mo ago

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Couldn't understand why 1<1 become true in following code?

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