Surprise! 0.77 * 100 == 76

[Alex Rest]

Try the code:

float a = 0.77F;
int b = (int)(100 * a);
Console.WriteLine(b.ToString());

Result is 76.

What do you think about such strange .Net calculate execution ?

[Norfy]

Nothing new! FAQ

[Syrix]

simple solution

decimal a = 0.77M;
int b = (int)(100 * a);
Console.WriteLine(b.ToString());

[aniskhan]

can also do it with float

                       float a = 0.77f;
			int b =  Convert.ToInt32(100 * a);
			console.WriteLine(b.ToString());

[Alex Rest]

simple solution

decimal a = 0.77M;
int b = (int)(100 * a);
Console.WriteLine(b.ToString());

Solution is not the problem.
I used Round, for example.
When I met the problem I was suppressed by so non-clear behavior of the code.
I always used double before.
Float was returned as object from DataRow element from correspond DB Field:-)
And I do not understand, why 100*0.77f == 76.99999…
Is it Microsoft or Intel?

[Syrix]

And I do not understand, why 100*0.77f == 76.99999…
Is it Microsoft or Intel?

it is because of the processor can never represent exactly 0.77 in binary.

[Norfy]

And I do not understand, why 100*0.77f == 76.99999…

That's why I posted the FAQ...