How to read Two numbers in c#

Question

INPUT

67 89 (in single line)

I have to input two numbers from console , and store in two different integers variable . HOw to do it.

Answer 1

This will read a line from the console, split the string, parse the integers, and output a list. You can then take each number from the list as needed.

Console.ReadLine().Split().Select(s => int.Parse(s)).ToList()

If there will always be two numbers you can do it as follows:

var integers = Console.ReadLine().Split().Select(s => int.Parse(s)).ToArray();
int first = integers[0];
int second = integers[1];

Areas for improvement:

• You might want to use TryParse instead of Parse and output a friendly error message if the input does not parse

• If you require exactly 2 numbers (no more, no less) you might want to check the length of integers and output a friendly error message if <> 2

---

TryParse() example as requested:

var numbers = new List<int>();

foreach (string s in Console.ReadLine().Split())
{
    if (int.TryParse(s, out int number))
        numbers.Add(number);
    else
        Console.WriteLine($"{s} is not an integer");
}

Answer 2

using System;
public class Program
{
    static void Main(string[] args)
    {
        var numbers = Console.ReadLine();
        var numberList = numbers.Split(' ');
        var number1 = Convert.ToInt32(numberList[0]);
        var number2 = Convert.ToInt32(numberList[1]);
        Console.WriteLine(number1 + number2);
        Console.ReadKey();
    }
}

If you executing from other program the you need to read from the args

Answer 3

var result = Console.ReadLine().Split(new [] { ' '});

Something along those lines, top of my head.

See the documentation for Console.ReadLine() and String.Split()

Using Linq you can then project into an int array:

var result = Console.ReadLine()
                    .Split(new[] { ' ' })  //Explicit separator char(s)
                    .Select(i => int.Parse(i))
                    .ToArray();

And even a bit terser:

var result = Console.ReadLine()
                    .Split()  //Assuming whitespace as separator
                    .Select(i => int.Parse(i))
                    .ToArray();

Result is now an array of ints.