Algorithm

Hacker Rank problem link - https://www.hackerrank.com/challenges/js10-let-and-const/problem

 

Hackerrank problem details - 

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.

Code Examples

#1 Code Example with Javascript Programming

Code - Javascript Programming


//Main part
function main() {

    let r, area, perimeter;
    const PI = Math.PI;
    
    r = readLine();
    
    // Print the area of the circle:
    area = PI * r * r;
    console.log(area);
    
    // Print the perimeter of the circle:
    perimeter = 2 * PI * r;
    console.log(perimeter);

    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.");
    }
}
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Input

x
–
+
cmd
2.6

Output

x
–
+
cmd
21.237166338267002
16.336281798666924
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Demonstration

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