Question Floating point range

[Syed Hamza Ali tirmizi]

THe float point range is (+,-)1.5e−45 to (+,-)3.4e38.
Q1: Does that mean +1.5e−45 to +3.4e38 & -1.5e−45 to -3.4e38, please elaborate ?
Q2: If yes to Q1, then zero (infact values b/w -1.5e−45 to +1.5e−45) does not fall in any of range in Q1. How "0" (they) is mentioned in float?

Regards

 

[jmcilhinney]

If you want to understand floating-point numbers, start here:

Floating point - Wikipedia, the free encyclopedia

 

[Syed Hamza Ali tirmizi]

well i have read it, still no use.

 

[JohnH]

Maybe easier to read the range here: float (C# Reference)

 

[Syed Hamza Ali tirmizi]

range in my book for C#



the range in my book is confusing. lowest value could be (+ or -) 1.5*10^(-45). so if lowest is +1.5 * 10^(-45) then we can't express zero in floating point? am i right?

 

[JohnH]

am i right?

No, read what I posted.

 

[Syed Hamza Ali tirmizi]

Thanks

No, read what I posted.

Yes JohnH, page you shared is super easy.

Thanks.

But what does the range in picture gg.jpg represents.

 

[Syed Hamza Ali tirmizi]

also see:

 

[JohnH]

That doesn't correspond to C# data types, although C# float data type is represented by System.Single CLR type, but this is still a C# forum. Have a look here also: 4.1.6 Floating point types that talks about positive/negative/simple zero, and Single.Epsilon Field (System) for "smallest positive Single value that is greater than zero".