initializing float in a class

[john smith]

Hi,

I am trying to initialize a float in a class.

For example:

class ABC{

public:


private:
static const float = 3.3;

};

The compiler does not like that, and I don't know how to declare and define
a float that has class scope only.

Thanks in advance for your help.

[Mike Wahler]

Re: initializing float in a class


"john smith" <princetonharva rd@charter.net> wrote in message
news:f0JCd.3916 $fX3.1840@fe03. lga...[color=blue]
> Hi,
>
> I am trying to initialize a float in a class.
>
> For example:
>
> class ABC{
>
> public:
>
>
> private:
> static const float = 3.3;
>
> };
>
> The compiler does not like that, and I don't know how to declare and[/color]
define[color=blue]
> a float that has class scope only.[/color]

Only static constant integer types can be initialized
inside the class body. You also failed to give the
'float' object a name.

class ABC
{
public:

private:
static const float f;
};

const float ABC::f(3.3f);



I recommend preferring type 'double' over 'float' unless
you have a compelling reason to use the latter. 'double'
gives you much better precision.

-Mike

[Mike Hewson]

Re: initializing float in a class

john smith wrote:[color=blue]
> Hi,
>
> I am trying to initialize a float in a class.
>
> For example:
>
> class ABC{
>
> public:
>
>
> private:
> static const float = 3.3;[/color]

'static const float' is a type but you have no identifier.

Anyway I think only integrals are allowed for 'static const'.
[color=blue]
>
> };
>
> The compiler does not like that, and I don't know how to declare and define
> a float that has class scope only.
>
> Thanks in advance for your help.
>
>[/color]

--

Cheers
--
Hewson::Mike
"This letter is longer than usual because I lack the time to make it
shorter" - Blaise Pascal

[Ioannis Vranos]

Re: initializing float in a class

john smith wrote:
[color=blue]
> Hi,
>
> I am trying to initialize a float in a class.
>
> For example:
>
> class ABC{
>
> public:
>
>
> private:[/color]


You forgot an identifier.

static const float x = 3.3;[color=blue]
>
> };[/color]



However are you sure about the private part?




--
Ioannis Vranos

http://www23.brinkster.com/noicys

[Ioannis Vranos]

Re: initializing float in a class

Mike Hewson wrote:
[color=blue]
> Anyway I think only integrals are allowed for 'static const'.[/color]


Yes you are right. Here is also what VC++ 2003 and 2005 Beta say about it:


C:\c>cl /clr temp.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 13.10.3077 for .NET
Framework
Copyright (C) Microsoft Corporation 1984-2002. All rights reserved.

temp.cpp
temp.cpp(4) : error C2864: 'x' : only const static integral data members
can be
initialized inside a class or struct

C:\c>


C:\c>cl /clr temp.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 14.00.40904
for Microsoft (R) .NET Framework version 2.00.40607.16
Copyright (C) Microsoft Corporation. All rights reserved.

temp.cpp
temp.cpp(4) : error C2864: 'ABC::x' : only static const integral data
members ca
n be initialized within a class

C:\c>




--
Ioannis Vranos

http://www23.brinkster.com/noicys

[Ulrich Achleitner]

Re: initializing float in a class

if you need a const static float attribute in your class,
initialize it in the class's implementation file:

const float ClassName::floa tAttributeName = 2.2f;

On Tue, 4 Jan 2005 19:11:39 -0800, john smith
<princetonharva rd@charter.net> wrote:
[color=blue]
> Hi,
>
> I am trying to initialize a float in a class.
>
> For example:
>
> class ABC{
>
> public:
>
>
> private:
> static const float = 3.3;
>
> };
>
> The compiler does not like that, and I don't know how to declare and
> define
> a float that has class scope only.
>
> Thanks in advance for your help.
>
>[/color]



--
have a nice day
ulrich