Option yes/no C# Console

Question

I\'m creating a C# program for the Currency Converter by console. At the end I would to insert \"Continue? (yes/no)\". Here the user have to chose. I\'ve tried this but it

Answer 1

you want something like that

float Dollaro = 1.32f, Euro;
float Cambio;
string EuroStr;

     do
     {
        Console.Write("Euro: ");
        EuroStr = Console.ReadLine();
        Euro = float.Parse(EuroStr);

        Cambio = Dollaro * Euro;

        Console.WriteLine("Dollaro: " + Cambio);
        Console.WriteLine("Vuoi continuare? (yes/no)");
        Console.ReadLine();
        string risposta = Console.ReadLine();

            if (risposta.Equals("Y"))
            {
                Console.WriteLine("Yes");
                break;
            }
            else if (risposta.Equals("N"))
            {
                Console.WriteLine("No");
                break;
            }

      } while (risposta == "N");

but that's just a sample, you need to give more information so i'll give you better example. what does your code supposed to do? what other option does the user have? and so on

Answer 2

You need to 'read' answer to be able to test it.

answer = Console.ReadLine();

Answer 3

You should move code where you do operation to do while loop.

Try this:

    static void Main(string[] args)
    {
        float Dollaro = 1.32f, Euro;
        float Cambio;
        string EuroStr;

        string risposta = "Y";

        do
        {
            Console.Write("Euro: ");
            EuroStr = Console.ReadLine();
            Euro = float.Parse(EuroStr);

            Cambio = Dollaro * Euro;

            Console.WriteLine("Dollaro: " + Cambio);
            Console.WriteLine("Vuoi continuare? (yes/no)");               
            risposta = Console.ReadLine();

            if (risposta.Equals("Y"))
            {
                Console.WriteLine("Yes");                    
            }
            else if (risposta.Equals("N"))
            {
                Console.WriteLine("No");                    
            }

        } while (risposta == "Y");
    }

Answer 4

This should fix your problem: And you should make your variable "risposta" ToLower so that it doesnt matter if you type a small or big letter (y or Y)

float Dollaro = 1.32f, Euro;
            float Cambio;
            string EuroStr;

            string risposta = "Y";

            do
            {
                Console.Write("Euro: ");
                EuroStr = Console.ReadLine();
                Euro = float.Parse(EuroStr);

                Cambio = Dollaro * Euro;

                Console.WriteLine("Dollaro: " + Cambio);
                Console.WriteLine("Vuoi continuare? (yes/no)");
                risposta = Console.ReadLine();

                if (risposta.Equals("Y"))
                {
                    Console.WriteLine("Yes");
                }
                else if (risposta.Equals("N"))
                {
                    Console.WriteLine("No");
                }

            } while (risposta.ToLower() == "y");

Answer 5

Try this code:

int num1, num2; 
char oPt;
string Count;
do
{
    Console.WriteLine("Enter 1st Value");
    num1 = Convert.ToInt32(Console.ReadLine());
    Console.WriteLine("Enter 2nd Value : ");
    num2 = Convert.ToInt32(Console.ReadLine());
    Console.WriteLine(" + - * / ");
    oPt = Convert.ToChar(Console.ReadLine());

    if (oPt == '-')
    {
        Console.WriteLine("Result: " + (num1 - num2));
    }
    else if (oPt == '+')
    {
        Console.WriteLine("Result: " + (num1 + num2));
    }
    else if (oPt == '*')
    {
        Console.WriteLine("Result: " + (num1 * num2));
    }
    else if (oPt == '/')
    {
        Console.WriteLine("Result: " + (num1 / num2));
    }
    do
    {
        Console.WriteLine("Do you wish to calculate another? Yes (y) or No (n): ");
        Count = Console.ReadLine();
        var CountLower = Count?.ToLower();
        if ((CountLower == "y") || (CountLower == "n"))
            break;
        } while (true );
    } while (Count != "n");
} 

Answer 6

        float Dollaro = 1.32f, Euro, Cambio;
        string EuroStr;
        ConsoleKeyInfo risposta;
        do
        {
            Console.Write ( "Euro: " );
            EuroStr = Console.ReadLine ();
            bool result = Single.TryParse ( EuroStr, out Euro );
            if ( result )
            {
                Cambio = Dollaro * Euro;
                Console.WriteLine ( "Dollaro: " + Cambio );
            } else {
                Console.WriteLine ( "Please enter a number" );
            }
            bool check = false;
            do {
                Console.Write ( "\nVuoi continuare? (yes/no) " );
                risposta = Console.ReadKey ( true );
                check = !( ( risposta.Key == ConsoleKey.Y ) || ( risposta.Key == ConsoleKey.N ) );
            } while ( check );
            switch ( risposta.Key )
            {
                case ConsoleKey.Y: Console.WriteLine ( "Yes" ); break;
                case ConsoleKey.N: Console.WriteLine ( "No" ); break;
            } 
        } while ( risposta.Key != ConsoleKey.N );

I've changed some things:

• if I enter a character for the Euro - FormatException ^msdn. So I've added a TryParse();
• I've changed the response from string to ConsoleKeyInfo ^msdn - this makes the check for "Y" or "N" easier and I think clearer, and there is no need to cast the user input with ToLower() ^msdn and compare it with a string;
• also a check if the user presses "Y" or "N", while the input is different, the same message will appear - Console.Write ( "\nVuoi continuare? (yes/no) " );

In general you should filter all data\info ( whatever ) comes from the user, to avoid exception.