C# Float vs. VB.net Single - Namin' complainin'

Question

Why is it called a single in VB.net? I'm sure there is a good reason but it doesn't seem intuitive to a non formally trained programmer like me.

Answer 1

I think it is a shorthand for "Single-precision" Double is "Double-precision"

While C-style int and float was probably referring to "integer" and "floating point"

Answer 2

The technical name is a 'single precision floating point', 'single' because it takes a single word in memory (32 bits). A double, meanwhile, takes 64 bits on most architectures.

Answer 3

The reason is that both single and double are both Floating Point numbers.

single is short for Single Precision Floating Point Number (32 bits)
double is short for Double Precision Floating Point Number (64 bits)

Therefore to call a floating point number float is ambiguous.

http://en.wikipedia.org/wiki/Single_precision
http://en.wikipedia.org/wiki/Double_precision

Answer 4

BPAndrew's question seems to be really "why float in C# and Single in VB.NET", which noone actually answered, so here's my 2p...

The use of "float" in C# seems to be a throwback to its C/C++ heritage. "float" still maps to the System.Single type in C#, so the keyword just exists for convenience. You could just as well declare the variable as "Single" in C# the same as you do in VB.NET.

(And as stated above, naming them Single/Double actually makes more sense as they are single/double precision floating-point numbers.)

Answer 5

As others have said, they map to "single" and "double" precision binary floating point types. Personally I think it was a sideways step to just name System.Single and System.Double - why not System.Float32 and System.Float64 to match the integer types?

Answer 6

What's even more confusing is that what F# calls a float is actually a System.Double.