Number Palindrome
Programming Basics · JavaScript
TASK
Problem
Given a positive four-digit integer, print `YES` if it is a palindrome.
EXAMPLE
Example
1221
YES
LIMITS
Constraints
1000 ≤ n ≤ 9999
LEARN
Theory for this problem
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### Number Palindrome
Integer division separates higher decimal/time units, while `%` returns the remainder. These two operations let a program isolate digits or split a total number of seconds/minutes into components.
NEED HELP?
Hints
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['Decide which part comes from division and which part comes from the remainder.', 'First decide whether the task operates on characters, words, or the whole string; that determines the correct way to split the data.']
ANSWER
Solution
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const fs = require('fs');
const input = fs.readFileSync(0, 'utf8').trimEnd();
let n = Number(input);
let a = Math.floor((n) / (1000));
let b = (((Math.floor((n) / (100))) % (10)) + (10)) % (10);
let c = (((Math.floor((n) / (10))) % (10)) + (10)) % (10);
let d = (((n) % (10)) + (10)) % (10);
if (((a) === (d)) && ((b) === (c))) {
console.log("YES");
} else {
console.log("NO");
}