Java Program to Absolute difference as long with Explanation
Java
Easy
Data Types
26 views
1 min read
157 words
This problem helps you practice core Java fundamentals in a practical way. It builds intuition around absolute, difference, long. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Task: return absolute difference between two ints as a long (avoid overflow).
Input Format
Two integers a and b.
Output Format
A long value: absolute difference between a and b.
Constraints
• a and b are valid integers
• Must avoid integer overflow
Concept Explanation
If we subtract directly using int, overflow can happen.
So we first convert both numbers to long, then subtract,
and finally take absolute value.
Step-by-Step Logic
1.Read integers a and b.
2.Convert both to long:
• long x = a
• long y = b
3.Compute diff = x - y.
4.If diff < 0, make it positive (-diff).
5.Return diff.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
static long absDiff(int a,int b){long x=a;long y=b;long d=x-y;return d<0?-d:d;}
Output Example
Input:
2147483647 - (-2147483648)
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 absolute difference between two ints as a long (avoid overflow).
Input / Output
Input
Two integers a and b.
Output
A long value: absolute difference between a and b.
Constraints
• a and b are valid integers
• Must avoid integer overflow
Examples
Input:
2147483647 - (-2147483648)
Explanation
Concept Explanation
If we subtract directly using int, overflow can happen.
So we first convert both numbers to long, then subtract,
and finally take absolute value.
Step-by-Step Explanation
1.Read integers a and b.
2.Convert both to long:
• long x = a
• long y = b
3.Compute diff = x - y.
4.If diff < 0, make it positive (-diff).
5.Return diff.
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 long absDiff(int a,int b){long x=a;long y=b;long d=x-y;return d<0?-d:d;}
Solutions (0)
No solutions submitted yet. Be the first!
