Float parsing in C#

Question

In C# I declared an array of float in main()

float[] notas = new float[8];

Called the method and passed the array by reference also in main()

PopulateArray(ref notas);

Here's the implementation of the method PopulateArray(ref float[] arr1)

static void PopulateArray(ref float[] arr1)
    {
        bool vakid;

        for (int i = 0; i < arr1.Length; i++)
        {
            do
            {
                do
                {
                    Console.Write($"Insira nota {i + 1}  ==>");
                    vakid = float.TryParse(Console.ReadLine(), out arr1[i]);
                    if ((arr1[i] > 20.0) || (arr1[i] < 0.0))
                    {
                        Console.Write("\n\n\t\tAs notas só vão de 0 a 20\n\nPrima uma tecla para continuar");
                        Console.ReadKey();
                    }
                    Console.Clear();

                }while (!((arr1[i] <= 20) && (arr1[i] >= 0)));

            } while (!vakid); 
        }


    }

Used two loops, one to assure that the value inputed is between [0, 20] and another to ensure that whatever input is a decimal number (float). Before this implementation, the array notas was of integer and everything was working just fine, only integers were allowed and also in between the interval of [0, 20]. When I decided to change the type of data to float, whenever I type a decimal number (i.e. 3.0) it doesn't go through the outter loop, like if I were typing a character other than a number, much in the same way as when I type a letter. So how can I type decimal numbers to store in my array? Ty

Answer 1

I propose this alternative implementation :

static void PopulateArray(float[] arr1)
{

    for (int i = 1; i <= arr1.Length; i++)
    {
        float nota;

        Console.Write($"Insira nota {i}  ==> \n");

        while(! float.TryParse(Console.ReadLine(), out nota) || nota > 20.0f || nota < 0 )
        {
           // Bad input message
            Console.Write("\n\n\t\tAs notas só vão de 0 a 20\n\nPrima uma tecla para continuar");
        }

        arr1[i] = nota;
    }
}

Note that you don't need to pass the array by reference. It's a reference type, so a copy of the reference is passed and the method can work on it.

Answer 2

Culture issue aside (decimal separator of . vs ,), I'd get rid of one of the do loops like this:

    static void PopulateArray(float[] arr1)
    {
        bool vakid;
        for (int i = 0; i < arr1.Length; i++)
        {
            do
            {
                Console.Write($"Insira nota {i + 1}  ==>");
                vakid = float.TryParse(Console.ReadLine(), out arr1[i]);
                if (vakid)
                {
                    if ((arr1[i] > 20.0) || (arr1[i] < 0.0))
                    {
                        vakid = false;
                        Console.Write("\n\n\t\tAs notas só vão de 0 a 20\n\nPrima uma tecla para continuar");
                        Console.ReadKey();
                    }
                }
                else
                {
                    Console.Write("\n\n\t\tInvalid Entry\n\nPrima uma tecla para continuar");
                    Console.ReadKey();
                }                 
                Console.Clear();
            } while (!vakid);
        }
    }