Reading an integer from user input

Question

What I am looking for is how to read an integer that was given by the user from the command line (console project). I primarily know C++ and have started down the C# path. I

Answer 1

Try this it will not throw exception and user can try again:

        Console.WriteLine("1. Add account.");
        Console.WriteLine("Enter choice: ");
        int choice = 0;
        while (!Int32.TryParse(Console.ReadLine(), out choice))
        {
            Console.WriteLine("Wrong input! Enter choice number again:");
        }

Answer 2

You could just go ahead and try :

    Console.WriteLine("1. Add account.");
    Console.WriteLine("Enter choice: ");
    int choice=int.Parse(Console.ReadLine());

That should work for the case statement.

It works with the switch statement and doesn't throw an exception.

Answer 3

I used int intTemp = Convert.ToInt32(Console.ReadLine()); and it worked well, here's my example:

        int balance = 10000;
        int retrieve = 0;
        Console.Write("Hello, write the amount you want to retrieve: ");
        retrieve = Convert.ToInt32(Console.ReadLine());

Answer 4

You need to typecast the input. try using the following

int input = Convert.ToInt32(Console.ReadLine()); 

It will throw exception if the value is non-numeric.

Edit

I understand that the above is a quick one. I would like to improve my answer:

String input = Console.ReadLine();
int selectedOption;
if(int.TryParse(input, out selectedOption))
{
      switch(selectedOption) 
      {
           case 1:
                 //your code here.
                 break;
           case 2:
                //another one.
                break;
           //. and so on, default..
      }

} 
else
{
     //print error indicating non-numeric input is unsupported or something more meaningful.
}

Answer 5

You can convert the string to integer using Convert.ToInt32() function

int intTemp = Convert.ToInt32(Console.ReadLine());

Answer 6

Better way is to use TryParse:

Int32 _userInput;
if(Int32.TryParse (Console.Readline(), out _userInput) {// do the stuff on userInput}