C90: minimum size of long

[cpp_novice]

What is the minimum size of 'long' according to the ANSI 1990 standard?

I thow that c99 requires longs to be atleast 32bits wide.

Is there an electronic copy of the 1990 standard available online?

 

[Tom St Denis]

What is the minimum size of 'long' according to the ANSI 1990 standard?

I thow that c99 requires longs to be atleast 32bits wide.

Is there an electronic copy of the 1990 standard available online?

"long" has always been at least upto 2^31 - 1 and down to -2^31.
Unsigned long is at lesst 0...2^32 - 1

Note that doesn't mean that

a) It's incapable of representing things large than 2^31 or 2^32
[resp.]

b) Even if it can only represent upto 2^31/2^32 [resp] that it takes
32 bits to do that [padding/trap bits].

Tom

 

[Flash Gordon]

"long" has always been at least upto 2^31 - 1 and down to -2^31.

<pedant>
Actually, it is down to at least -(2^31 - 1). I.e., -2^31 might not be
valid, either due to being a trap on a 2s complement system (which I've
not come across) or due to the use of 1s complement or sign-magnitude.

Unsigned long is at lesst 0...2^32 - 1

Note that doesn't mean that

a) It's incapable of representing things large than 2^31 or 2^32
[resp.]

b) Even if it can only represent upto 2^31/2^32 [resp] that it takes
32 bits to do that [padding/trap bits].

The rest is all correct as far as I can see.

 

[pete]

cpp_novice wrote:

Is there an electronic copy of the 1990 standard available online?

http://webstore.ansi.org/ansidocstore/product.asp?sku=AS+3955-1991

 

[Dik T. Winter]

> Actually, it is down to at least -(2^31 - 1). I.e., -2^31 might not be
> valid, either due to being a trap on a 2s complement system (which I've
> not come across) or due to the use of 1s complement or sign-magnitude.

The Gould NP1.