JS10 Day 1: Let and Const

개요

Day 1: Let and Const

• https://www.hackerrank.com/challenges/js10-let-and-const/problem

해커랭크 10 Days of Javascript

#	문제	비고
0-1 Day e
1	JS10 Day 0: Hello, World!
2	JS10 Day 0: Data Types
3	JS10 Day 1: Arithmetic Operators
4	JS10 Day 1: Functions
5	JS10 Day 1: Let and Const

---

'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
    inputString += inputStdin;
});

process.stdin.on('end', _ => {
    inputString = inputString.trim().split('\n').map(string => {
        return string.trim();
    });
    
    main();    
});

function readLine() {
    return inputString[currentLine++];
}

function main() {
    const PI = Math.PI;
    let r = readLine();
    console.log( PI*r*r );
    console.log( 2*PI*r );

    try {    
        // Attempt to redefine the value of constant variable PI
        PI = 0;
        // Attempt to print the value of PI
        console.log(PI);
    } catch(error) {
        console.error("You correctly declared 'PI' as a constant.");
    }
}