Why It is error?

Question

Idk why It is an error can anyone tell me plz
const double PI =3.1416;
int r = int.Parse(Console.ReadLine());
double area = (r * r * PI);
Console.WriteLine("L'area del cercle es: {2}", area);

Answer 1

The first placeholder can't start with two, you have to replace it with zero.

const double PI =3.1416;
int r = int.Parse(Console.ReadLine());
double area = (r * r * PI);
Console.WriteLine("L'area del cercle es: {0}", area);

Answer 2

Plz