Console terminates after console.read(), even with console.readline() at the end

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The following code asks for your name and surname.

C#

class Program
{
        static void Main(string[] args)
        {
            Console.Write("Enter your name: ");
            string s = Console.ReadLine();
            Console.WriteLine("Your name: " + s);
            Console.Write("Enter your surname: ");
            int r = Console.Read();
            Console.WriteLine("Your surname: " + r);

            Console.ReadLine();
        }
}

After entering the name, the program successfully displays your input. However, after entering a surname, the program stops immediately. From my understanding, Console.Read() should return an int value of the first character of the string I enter (ASCII code?).

Why does the program terminate right after Console.Read()? Shouldn't Console.ReadLine() ensure the program stays open?

What I have tried:

if i use string r = Console.ReadLine();
then it works well.

Posted 6-Jan-17 8:55am

Member 9346617

Updated 6-Jan-17 17:45pm

Wendelius

v2

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Comments

[no name] 6-Jan-17 15:32pm

Catch the exception your are getting and see what it says.

Jon McKee 6-Jan-17 23:51pm

No exception, it's a quirk of Read() if you were curious :)

ZurdoDev 6-Jan-17 16:47pm

The big error message that you get will answer your question.

Jon McKee 6-Jan-17 23:48pm

There's no error message. It's a quirk of Read() and why MSDN recommends not using it anymore :)

ZurdoDev 7-Jan-17 10:44am

OK

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Narud Shiro · Accepted Answer · 2017-01-06T14:12:00

Your program don't stay open because the last Console.ReadLine() takes the [Enter] you pressed on Console.Read() instruction.

You might want to use ReadKey() instead of Read() to achieve the desired functionality.

C#

Console.Write("Enter your name: ");
string s = Console.ReadLine();
Console.WriteLine("Your name: " + s);
Console.Write("Enter your surname: ");
string r = Console.ReadKey(false).KeyChar.ToString();
Console.WriteLine();
Console.WriteLine("Your surname: " + r);
Console.WriteLine("Press any key to continue...");

Console.ReadKey(true);

Best regards!

Jon McKee · Accepted Answer · 2017-01-06T17:45:00

Console.Read() accepts values into the input stream until Enter is pressed. Each subsequent call to Console.Read() reads a single character from that input. Console.ReadLine() retrieves a full line from the input stream. Do you see what's going wrong?

If you type in "XYZ" and press Enter at Console.Read() you have "YZ<enter>" in the input stream with r set to X. Then Console.ReadLine() picks up the remaining "YZ<enter>" and the program terminates. This quirk is why MSDN recommends not to use Console.Read() favoring Console.ReadLine() and Console.ReadKey() instead.

This is easily demonstrated with the following code:

C#

int r = Console.Read();
Console.WriteLine(Console.ReadLine());
Console.ReadKey();

Typing "XYZ" then Enter will yield the following output:

XYZ
YZ

Console terminates after console.read(), even with console.readline() at the end

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