CODEWITHSUNDEEP
c#asp.net
stpdevi
stpdevi

Reputation: 1114

Is it possible to check double and char data types

One interviewer asked this question to me ,when I am checking it's working how it is possible to check type of char and double? Please any one explain me.

class Program
{
    static void Main(string[] args)
    {
        double d=0;

        if((double)d == 'c')
        {
            Console.WriteLine("working");
        }
        else 
        { 
            Console.WriteLine("not"); 
        }

        Console.ReadLine();
    }
}

Upvotes: 4

Views: 246

Answers (3)

Tejas Vaishnav
Tejas Vaishnav

Reputation: 458

Actually when you are trying to compare any numeric value to char value, its not giving you any compile time or run time error, because char is actually represent int16 or 16-bit integer value, so when you try to compare double, integer or long with it, it will simple compare its ASCII value of that character with it. here is some example...

double d = 65;
if (d == 'A')
{
    Console.WriteLine("working");
}
else { Console.WriteLine("not"); }

the above code's out put is "Working" because char "A" ASCII value is 65 and you are comparing it with 65 so it true with if condition.

Upvotes: 0

Dmitrii Bychenko
Dmitrii Bychenko

Reputation: 186813

Char type is actually a 16-bit integer, so you can compare them if you like:

  Double left = 'B'; // <- 66.0
  Char right = 'A';  // <- it's 16-bit int == 65 in fact 

  if (left > right) {...}

There's one issue, however: you should not use == or != without tolerance, since Double as well as other floating point types has round-up error, so

  Double left = 66;

could be in fact 66.000000000002 or 65.9999999999998. Something like that:

  Double left = 'B'; // <- 66.0
  Char right = 'A';  // <- it's 16-bit int == 65 in fact 

  // (left == right) comparison with tolerance
  // Since right is integer in fact, 0.1 tolerance is OK
  if (Math.Abs(left - right) < 0.1) {...}

Upvotes: 8

Aftab Ahmed
Aftab Ahmed

Reputation: 1737

you can use the normal GetType() and typeof() to check type of an any object. like this

class Program
{
    static void Main(string[] args)
    {
      double d=0;

      if(d.GetType() == typeof(Char))
      {
        Console.WriteLine("working");
      }
      else 
      { 
        Console.WriteLine("not"); 
      }

      Console.ReadLine();
   }
}

Upvotes: 2

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