Inversion of "For" does not work correctly. What for?

Question

for (float i = -1; i <= 1; i+=0.1f) { Console.WriteLine(i); } 

These are the results.

 -1 -0.9 -0.8 -0.6999999 -0.5999999 -0.4999999 -0.3999999 -0.2999999 -0.1999999 -0.09999993 7.450581E-08 0.1000001 0.2000001 0.3000001 0.4000001 0.5000001 0.6000001 0.7000001 0.8000001 0.9000002 

Answer 1

Since float is not an exact decimal number, but a floating point number. Use decimal instead.

See Wikipedia for reference: Wikipedia

Answer 2

Float and double cannot accurately display decimal values. Look at wikipedia how they are implemented.

You can use Decimal instead.

Answer 3

You need to read the following:

What Every Computer Scientist Should Know About Floating Point Numbers

Answer 4

Use integers for indexing purposes. And if you need float values ​​inside the loop, calculate it there:

 for (int i = -10; i <= 10; i++) { Console.WriteLine(i / (float) 10); } 

Answer 5

float is a 32-bit floating point number . He cannot accurately represent these values. Here's another mandatory-reading read-only article specifically for .NET: http://csharpindepth.com/Articles/General/FloatingPoint.aspx

Answer 6

This is because you use floating points. The calculation of floating points is not entirely correct, because your computer uses binary numbers inside, not decimal numbers. Good information on this problem is given here: http://floating-point-gui.de/