Why this code don't work in Sololearn, but work in VSCode?

Question

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 = ConvertToDouble(Console.ReadLine());
Console.WriteLine(pi*radius*radius);

}
}
}

Answer 1

Уалихан Мукашев ,

there is a typo, it has to be :

double radius = Convert.ToDouble(Console.ReadLine());
^ the dot was missing

Answer 2

Was there any error message from VSCode? if so what was it? and on which line?

I think your code was missing a '.' between `Convert` and `ToDouble` in the line where you read input for <radius>

double radius = Convert.ToDouble(Console.ReadLine());

Answer 3

Thank you, I understand what the error is. I was not careful and missed the point. Sorry for my English)