How to solve the input string was not in the correct format. / Como resolver a sequência de entrada não estava no formato correto.

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Me ajuda a resolver este problemas amigo, confesso que não vi uma forma de validar para resolver.

Google Translate:
Help me to solve this problem friend, I confess that I didn't see a way to validate to solve it.

What I have tried:

using System;
using System.Globalization;

namespace _1002
{
    class Program
    {
        static void Main(string[] args)
        {
            double R = Convert.ToDouble(Console.ReadLine());
            double A = Math.PI * Math.Pow(R, R);
            Console.WriteLine("A = " +A.ToString("F4",CultureInfo.InvariantCulture));
           // Console.ReadLine();
        }
    }
}

Posted 17-Feb-20 17:47pm

OsvaldoFernandoQueta

Updated 17-Feb-20 20:33pm

OriginalGriff

v2

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Patrice T 18-Feb-20 1:13am

English please.

1 solution

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OriginalGriff · Answer 1 · 2020-02-17T20:33:00

You can't "solve" an in put string format problem: it says what it means: the user typed a value that cannot be interpreted as a valid double

You can prevent you app from crashing though:

C#

double R;
while (true)
   {
   Console.Write("Please enter the radius of the circle :"); 
   string input = Console.ReadLine();
   if (double.TryParse(input, out R))
      {
      break;
      }
   Console.WriteLine($"\"{input}\" is not a valid number.");
   }
double A = Math.PI * Math.Pow(R, R);
Console.WriteLine("A = ", A.ToString("F4",CultureInfo.InvariantCulture));