Hello World! What's wrong

Question

We are going to write a program that will calculate the area of ​​a circle.
The area enclosed by a circle of radius r is πr², where π (pi) is the constant ratio of the circumference of any circle to its diameter, and r is the radius.
The given program declares a constant pi variable with a value of 3.14.
Complete the program to take the radius as input, then calculate and output the area of the circle.

Sample Input
5

Sample Output
78.5
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
const double pi = 3.14;
double radius;
radius = Console.ReadLine();
double p = pi * (radius * radius );
Console.WriteLine(pi * ( radius * radius ));

}
}
}

Answer 1

Thanks