How to restrict the user input to five digits?

Question

I\'m trying to restrict the user to only input 5 digits into the console for C#. I have my code error check the user, but for some reason after I type let\'s say...6 digits, the

Answer 1

You are accessing console multiple times. Check for length of your captured input - temp. Try this:

var temp = Console.ReadLine();
while (temp.Length > 5)
{
    Console.WriteLine("Error. Zip code is not 5 digits. Please enter a valid number.");
    temp = Console.ReadLine(); 
}

address.zipCode = int.Parse(temp);

Answer 2

dont use Console.Readline() again and again

change your code like this.

    Console.WriteLine("Enter the the zip code of the contact.");
     var temp = int.Parse(Console.ReadLine());

        while (temp.ToString().Length != 5)
        {
            Console.WriteLine("Error. Zip code is not 5 digits. Please enter a valid number.");
            temp = int.Parse(Console.ReadLine());

            if (temp.ToString().Length == 5)
            {
                temp = int.Parse(Console.ReadLine());

            }
        }

(to save from null reference you can do if(temp < 100000 && temp > 9999) also.)

Answer 3

It can be done this way...

            Console.WriteLine("Enter the the zip code of the contact.");
            var temp = Console.ReadLine();
            string zipcode = string.Empty;
            while (temp.Length != 5)
            {
                Console.WriteLine("Error. Zip code is not 5 digits. Please enter a valid number.");
                if (temp.Length == 5)
                {
                    zipcode = temp;
                    break;
                }
                else
                {
                    temp = Console.ReadLine();
                }
            }
            Console.Write(zipcode);

Answer 4

Please view the code given below. I think this will fulfill your requirement. I have found that you have use address.zipCode which has not been declared anywhere in given code so I have replace the address.zipCode with zipCode.

        int temp,zipCode;

        bool breakLoop = false;

        Console.WriteLine("Enter the the zip code of the contact.");

        while (breakLoop == false)
        {
            string userInput = Console.ReadLine();
            if (userInput.Length != 5)
            {
                Console.WriteLine("Error. Zip code is not 5 digits. Please enter a valid number.");
                continue;
            }

            int.TryParse(userInput, out temp);
            if (temp == 0)
            {
                Console.WriteLine("Error. Please enter a valid number.");
                continue;
            }                

            zipCode = temp;
            breakLoop = true;
            break;

        }

Please let me know if you have any problem with the code.

Answer 5

Modify your statements as

Console.WriteLine("Enter the the zip code of the contact.");

do
{
    temp = Console.ReadLine();
    if (temp.Length!=5)
    {
        Console.WriteLine("Error. Zip code is not 5 digits. Please enter a valid number.");
    }
    else
    {
        address.zipCode = temp;
    }
} while(temp.Length!=5);

done!

Answer 6

I think you can use like this also.. if u want to check all the lengths.

if (Console.ReadLine().Length == 5)
    {
        temp = int.Parse(Console.ReadLine());
        address.zipCode = temp;
    }
else{
while (Console.ReadLine().Length != 5)
{
    Console.WriteLine("Error. Zip code is not 5 digits. Please enter a valid number.");
    temp = int.Parse(Console.ReadLine());
    }
}