Java Program to Split integer into digits array with Explanation
Java
Hard
Data Types
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1 min read
165 words
This problem helps you practice core Java fundamentals in a practical way. It builds intuition around digit, order, non-negative. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Task: return digits of a non-negative number in correct order.
Input Format
A non-negative integer n.
Output Format
An array/list of digits in correct order.
Constraints
• n ≥ 0
• Must preserve digit order
Concept Explanation
Digits should appear in the same order as in the number.
We extract digits and then reverse them (since extraction gives reverse order).
Step-by-Step Logic
1.Read integer n.
2.If n == 0, return [0].
3.Create an empty list.
4.While n > 0:
• Extract digit using n % 10.
• Add digit to list.
• Divide n = n / 10.
5.Reverse the list (because digits were added in reverse order).
6.Return the list.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
static int[] digits(int n){if(n==0) return new int[]{0};int x=n;int len=0;while(x>0){len++;x/=10;}int[] d=new int[len];x=n;for(int i=len-1;i>=0;i--){d[i]=x%10;x/=10;}return d;}
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
Task: return digits of a non-negative number in correct order.
Input / Output
Input
A non-negative integer n.
Output
An array/list of digits in correct order.
Constraints
• n ≥ 0
• Must preserve digit order
Explanation
Concept Explanation
Digits should appear in the same order as in the number.
We extract digits and then reverse them (since extraction gives reverse order).
Step-by-Step Explanation
1.Read integer n.
2.If n == 0, return [0].
3.Create an empty list.
4.While n > 0:
• Extract digit using n % 10.
• Add digit to list.
• Divide n = n / 10.
5.Reverse the list (because digits were added in reverse order).
6.Return the list.
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Official Solution
static int[] digits(int n){if(n==0) return new int[]{0};int x=n;int len=0;while(x>0){len++;x/=10;}int[] d=new int[len];x=n;for(int i=len-1;i>=0;i--){d[i]=x%10;x/=10;}return d;}
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