CODEWITHSUNDEEP
c#input
TomG
TomG

Reputation: 1059

Reading an integer from user input

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 know that Console.ReadLine(); only takes a char/string. So in short I am looking for the integer version of this.

Just to give you an idea of what I'm doing exactly:

Console.WriteLine("1. Add account.");
Console.WriteLine("Enter choice: ");
Console.ReadLine(); // Needs to take in int rather than string or char.

I have been looking for quite a while for this. I have found a lot on C but not C#. I did find however a thread, on another site, that suggested to convert from char to int. I'm sure there has to be a more direct way than converting.

Upvotes: 92

Views: 669372

Answers (15)

Davak72
Davak72

Reputation: 86

I know this question is old, but with some newer C# features like lambda expressions, here's what I actually implemented for my project today:

private static async Task Main()
{
    // -- More of my code here
    Console.WriteLine("1. Add account.");
    Console.WriteLine("2. View accounts.");

    int choice = ReadInt("Please enter your choice: ");
    // -- Code that uses the choice variable
}

// I have this as a public function in a utility class,
// but you could use it directly in Program.cs
private static int ReadInt(string prompt)
{
    string text;
    do
    {
        Console.Write(prompt);
        text = Console.ReadLine();
    } while (!text.Where(c => char.IsNumber(c)).Any());

    return int.Parse(new string(text.Where(c => char.IsNumber(c)).ToArray()));
}

The difference here is that if you accidentally type a number and any other text along with that number, only the number is parsed.

Upvotes: 1

Eytan Yegudayev
Eytan Yegudayev

Reputation: 1

You can use this function:

Convert.ToSingle(Console.ReadLine());

Upvotes: 0

Patrice Polycarpe
Patrice Polycarpe

Reputation: 1

Declare a variable that will contain the value of the user input : Ex :

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

Upvotes: 0

SendETHToThisAddress
SendETHToThisAddress

Reputation: 3704

I didn't see a good and complete answer to your question, so I will show a more complete example. There are some methods posted showing how to get integer input from the user, but whenever you do this you usually also need to

  1. validate the input
  2. display an error message if invalid input is given, and
  3. loop through until a valid input is given.

This example shows how to get an integer value from the user that is equal to or greater than 1. If invalid input is given, it will catch the error, display an error message, and request the user to try again for a correct input.

static void Main(string[] args)
{
    int intUserInput = 0;
    bool validUserInput = false;

    while (validUserInput == false)
    {
        try
        {
            Console.Write("Please enter an integer value greater than or equal to 1: ");
            intUserInput = int.Parse(Console.ReadLine()); //try to parse the user input to an int variable
        }
        catch (Exception e) //catch exception for invalid input, such as a letter
        {
            Console.WriteLine(e.Message);
        }

        if (intUserInput >= 1) { validUserInput = true; }
        else { Console.WriteLine(intUserInput + " is not a valid input, please enter an integer greater than 0."); }

    } //end while

    Console.WriteLine("You entered " + intUserInput);
    Console.WriteLine("Press any key to exit ");
    Console.ReadKey();
} //end main

In your question it looks like you wanted to use this for menu options. So if you wanted to get int input for choosing a menu option you could change the if statement to

if ( (intUserInput >= 1) && (intUserInput <= 4) )

This would work if you needed the user to pick an option of 1, 2, 3, or 4.

Upvotes: 4

Brezzi
Brezzi

Reputation: 1

You could create your own ReadInt function, that only allows numbers (this function is probably not the best way to go about this, but does the job)

public static int ReadInt()
    {
        string allowedChars = "0123456789";

        ConsoleKeyInfo read = new ConsoleKeyInfo();
        List<char> outInt = new List<char>();

        while(!(read.Key == ConsoleKey.Enter && outInt.Count > 0))
        {
            read = Console.ReadKey(true);
            if (allowedChars.Contains(read.KeyChar.ToString()))
            {
                outInt.Add(read.KeyChar);
                Console.Write(read.KeyChar.ToString());
            }
            if(read.Key == ConsoleKey.Backspace)
            {
                if(outInt.Count > 0)
                {
                    outInt.RemoveAt(outInt.Count - 1);
                    Console.CursorLeft--;
                    Console.Write(" ");
                    Console.CursorLeft--;
                }
            }
        }
        Console.SetCursorPosition(0, Console.CursorTop + 1);
        return int.Parse(new string(outInt.ToArray()));
    }

Upvotes: 0

Mohamed Elamin
Mohamed Elamin

Reputation: 375

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:");
        }

Upvotes: 1

Zohaib ur Rehman
Zohaib ur Rehman

Reputation: 51

Use this simple line:

int x = int.Parse(Console.ReadLine());

Upvotes: 5

kunleth
kunleth

Reputation: 1

static void Main(string[] args)
    {
        Console.WriteLine("Please enter a number from 1 to 10");
        int counter = Convert.ToInt32(Console.ReadLine());
        //Here is your variable
        Console.WriteLine("The numbers start from");
        do
        {
            counter++;
            Console.Write(counter + ", ");

        } while (counter < 100);

        Console.ReadKey();

    }

Upvotes: 0

Marco
Marco

Reputation: 23927

I would suggest you use TryParse:

Console.WriteLine("1. Add account.");
Console.WriteLine("Enter choice: ");
string input = Console.ReadLine();
int number;
Int32.TryParse(input, out number);

This way, your application does not throw an exception, if you try to parse something like "1q" or "23e", because somebody made a faulty input.

Int32.TryParse returns a boolean value, so you can use it in an if statement, to see whether or not you need to branch of your code:

int number;
if(!Int32.TryParse(input, out number))
{
   //no, not able to parse, repeat, throw exception, use fallback value?
}

To your question: You will not find a solution to read an integer because ReadLine() reads the whole command line, threfor returns a string. What you can do is, try to convert this input into and int16/32/64 variable.

There are several methods for this:

If you are in doubt about the input, which is to be converted, always go for the TryParse methods, no matter if you try to parse strings, int variable or what not.

Update In C# 7.0 out variables can be declared directly where they are passed in as an argument, so the above code could be condensed into this:

if(Int32.TryParse(input, out int number))
{
   /* Yes input could be parsed and we can now use number in this code block 
      scope */
}
else 
{
   /* No, input could not be parsed to an integer */
}

A complete example would look like this:

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Hello World!");
        var foo = Console.ReadLine();
        if (int.TryParse(foo, out int number1)) {
            Console.WriteLine($"{number1} is a number");
        }
        else
        {
            Console.WriteLine($"{foo} is not a number");
        }
        Console.WriteLine($"The value of the variable {nameof(number1)} is {number1}");
        Console.ReadLine();
    }
}

Here you can see, that the variable number1 does get initialized even if the input is not a number and has the value 0 regardless, so it is valid even outside the declaring if block

Upvotes: 78

yagohaw
yagohaw

Reputation: 81

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());

Upvotes: 3

font
font

Reputation: 91

int op = 0;
string in = string.Empty;
do
{
    Console.WriteLine("enter choice");
    in = Console.ReadLine();
} while (!int.TryParse(in, out op));

Upvotes: 9

Kajal Sinha
Kajal Sinha

Reputation: 1565

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.
}

Upvotes: 10

CodingDefined
CodingDefined

Reputation: 2132

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

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

Upvotes: 168

user4655759
user4655759

Reputation: 1

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.

Upvotes: -1

Alexander Bell
Alexander Bell

Reputation: 7918

Better way is to use TryParse:

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

Upvotes: 2

Related Questions