Solving the problem of floating point calculation in C#

Let me show you a calculation problem to see your arithmetic ability.

0.1 +0.1 +0.1 - 0.3 equals what?

You may ask such a simple question, are you looking down on me? It must be equal to 0.

There is no problem if you calculate directly, but what if you use a computer?

The time to witness the miracle has arrived, look at the code:

void Main()
{    var f = 0.1 +0.1 +0.1 -0.3;
    Console.WriteLine("f=={0}",f);
}

Running result:

This is because of the accuracy of the computer, the lack of accuracy in the internal storage and operation of the computer, etc. I may not be able to explain it clearly, but you can use the following solution. Solution:

void Main()
{    //var f = 0.1 +0.1 +0.1 -0.3;    //Console.WriteLine("f=={0}",f);
    
    var f1 = new Decimal(0.1) + new Decimal(0.1) + new Decimal(0.1) - new Decimal(0.3);
    Console.WriteLine("f1 == {0}",f1);
}

Running result:

This is the normal operation result.

La la la! ! ! !

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