My program close, before i write numbers (calculating option)

Question

I dont know why my program close before i write numbers (in calculating option). And what is wrong with labels. Someone help ? Sorry for this. It's must be easy for you.

class Program
{
    static void Main(string[] args)
    {
        string str;
        double parametrA, parametrB, parametrC;
        Console.Write("Chose a option: \n");
        Console.Write("calculating - calculating square equation \n");
        Console.Write("series - even or odd \n");
        Console.Write("exit - close program \n");
        Console.ReadKey();
        while (true)
        {
            str = Console.ReadLine();
            if (str == "calculating")
            {
                goto label1;                     
            }
            else
            {
                if (str == "series")
                {
                    goto label2;
                }
                else
                {
                    if (str == "exit")
                    {
                        goto label3;
                    }
                }
            }

        label1:
            Console.WriteLine("calculating: \n");
            Console.WriteLine("enter parameters: \n");



            if (args.Length < 3)
            {
                Console.WriteLine("not enaught data \n");
                return;
            }
            try
            {
                parametrA = Double.Parse(args[0]);

                parametrB = Double.Parse(args[1]);

                parametrC = Double.Parse(args[2]);

//i shuld make a console.readkey()?

            }
            catch (Exception)
            {
                Console.WriteLine("One of the parameters isnt a correct number! ");
                return;
            }
            Console.WriteLine("Introduced equation parameters: \n");
            Console.Write("Parametr A = " + parametrA + "Parametr B = " + parametrB + "Parametr C = " + parametrC + "\n");
            if (parametrA == 0)
            {
                Console.WriteLine("It isn't a square equation! ");
            }
            else
            {
                double delta = parametrB * parametrB - 4 * parametrA * parametrC;
                double score;
                if (delta < 0)
                {
                    Console.WriteLine("Delta < 0! ");
                }
                else if (delta == 0)   
                {
                    score = -parametrB / (2 * parametrA);
                    Console.WriteLine("x = " + score);
                }
                else
                { 
                score = (-parametrB + Math.Sqrt(delta)) / (2 * parametrA);
                Console.WriteLine("x1 = " + score);
                score = (-parametrB - Math.Sqrt(delta)) / (2 * parametrA);
                Console.WriteLine("x2 = " + score);
                }

            }

If i separate labels, i can't compilate.

           label2:
                Console.WriteLine("odd numbers : \n");
                for (int i = 1; i <= 10; i++)
                {
                    if (i % 2 != 0)
                        Console.WriteLine(i);
                    else
                        Console.WriteLine("even!");
                }

This label work correct
label3: Console.WriteLine("exit \n"); if (str == "exit") { break; }

        }
     }
}

}

score 0 · Answer 1 · answered Aug 04 '17 at 11:47

The following reads parameters from the program's command line arguments (the args array passed in to the main method.

parametrA = Double.Parse(args[0]);
parametrB = Double.Parse(args[1]);
parametrC = Double.Parse(args[2]);

What you probably want here are readLine calls as you've been using above.

EDIT: As for the compilation issue. Please post a properly formatted full example of the code that does not compile and do also post the compiler error as it will most likely say what's wrong with your code.

My program close, before i write numbers (calculating option)

1 Answers1