how we can determine the type of a variable declared with var key word in c#

Question

1. I want to get input from user and print the type of the input given by user.
2. I have tried this.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution
{

    static void Main(String[] args)
    {
        var userObj = Console.ReadLine();

        // if input is 5 it should print it is of type int.

        //if input is 5.4 it should print it is of type double.
        Console.WriteLine(userObj.GetType());// printing only string

    }
}

---

also tried this but always going false

using System;
class Solution
{

    static void Main(String[] args)
    {
        var userObj = Console.ReadLine();
        if (string.Format(userObj) == string .Format("0"))
        {
            Console.WriteLine("it is of type interger");
        }
    }
}

Answer 1

You're misunderstanding how var works in C#. C# is a strongly-typed language and as such it's not the same as other languages that use var like JavaScript. Therefore, the variable declared as var already knows what type it is at compile time.

Console.ReadLine() returns a string, therefore the variable userObj in this sense WILL be a string. You will never get anything but a string type.

You can, however, try several things to see if you can convert it to another type. for example:

var userInput = Console.ReadLine();
int x;
if(int.TryParse(userInput, out x))
{
    Console.WriteLine("That's an int!");
}

Answer 2

Try parse some with some different number datatypes from biggest to smallest. I assume you want to store the number in the smallest one possible.

float var1;
double var2;
int var3;

if (float.TryParse(urMom, out var1))
    Console.WriteLine("Float");
else if (double.TryParse(urMom, out var2))
    Console.WriteLine("Double");
else if (int.TryParse(urMom, out var3))
    Console.WriteLine("Int");