DAY 1: Let and Const | Hackerrank Solution | 10 Days Of Javascript

DAY 1: Let and Const 

Hackerrank Solution 10 Days Of Javascript

Objective

In this challenge, we practice declaring variables using the let and const keywords. Check out the attached tutorial for more details.

Task

1. Declare a constant variable, , and assign it the value Math.PI. You will not pass this challenge unless the variable is declared as a constant and named PI (uppercase).
2. Read a number, , denoting the radius of a circle from stdin.
3. Use  and  to calculate the  and  of a circle having radius .
4. Print  as the first line of output and print  as the second line of output.

Input Format

A single integer, , denoting the radius of a circle.

Constraints

•  is a floating-point number scaled to at most  decimal places.

Output Format

Print the following two lines:

1. On the first line, print the  of the circle having radius .
2. On the second line, print the  of the circle having radius .

Sample Input 0

2.6

Sample Output 0

21.237166338267002

16.336281798666924

Explanation 0

Given the radius , we calculate the following:

We then print  as our first line of output and  as our second line of output.

SOLUTION

function main() { // Write your code here. Read input using 'readLine()' and print output using 'console.log()'. const PI = Math.PI; const r = readLine(); // Print the area of the circle: var area = PI * r * r; console.log(area); // Print the perimeter of the circle: var peri = 2 * PI * r; console.log(peri);

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