| Topic: |
DEVELOP > c-Plus-Plus |
| User: |
"" |
| Date: |
10 Dec 2004 10:48:53 AM |
| Object: |
number of bytes for a type in C++ |
In C++, the amount of memory used to store int is 4 bytes, or dependent
upon the hardware?
I think still dependent on the machine, since C++ compiler is platform
dependent.
Please advise. Thanks
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| User: "Keith Thompson" |
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| Title: Re: number of bytes for a type in C++ |
10 Dec 2004 02:42:55 PM |
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writes:
In C++, the amount of memory used to store int is 4 bytes, or dependent
upon the hardware?
I think still dependent on the machine, since C++ compiler is platform
dependent.
In C, it's dependent on the implementation, with some specific
constraints imposed by the standard.
But since your question is about C++, cross-posting it to comp.lang.c
was a bad idea.
Followups redirected.
--
Keith Thompson (The_Other_Keith) <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.
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| User: "Rolf Magnus" |
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| Title: Re: number of bytes for a type in C++ |
10 Dec 2004 02:55:09 PM |
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Keith Thompson wrote:
jrefactors@hotmail.com writes:
In C++, the amount of memory used to store int is 4 bytes, or dependent
upon the hardware?
I think still dependent on the machine, since C++ compiler is platform
dependent.
In C, it's dependent on the implementation, with some specific
constraints imposed by the standard.
The same is true for C++. The rules regarding integer type sizes are the
same in C++ as in C, with the exception that C++ doesn't know the "long
long" type.
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| User: "Victor Bazarov" |
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| Title: Re: number of bytes for a type in C++ |
10 Dec 2004 10:59:47 AM |
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wrote:
In C++, the amount of memory used to store int is 4 bytes, or dependent
upon the hardware?
I think still dependent on the machine, since C++ compiler is platform
dependent.
You think right.
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| User: "JH Trauntvein" |
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| Title: Re: number of bytes for a type in C++ |
10 Dec 2004 10:59:21 AM |
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I believe that the standard guarantees minimum ranges for intrinsic
types. For example, I believe that the minimum range for type int is
[-32768, +32767].
Regards,
Jon Trauntvein
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| User: "" |
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| Title: Re: number of bytes for a type in C++ |
10 Dec 2004 11:07:28 AM |
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It is depending upon the hardware.
According to TCPPPL,
this is what guaranteed about the sizes of fundamental types
1 = sizeof(char) <= sizeof(short) <= sizeof(int) <=sizeof(long)
1<= sizeof(bool) <= sizeof(long)
sizeof(char) <=sizeof(wchar_t) <= sizeof(long)
sizeof(float) <= sizeof(double) <= sizeof(long double)
sizeof(N) = sizeof(signed N) = sizeof(unsigned N)
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| User: "Mark McIntyre" |
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| Title: Re: number of bytes for a type in C++ |
10 Dec 2004 11:51:18 AM |
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On 10 Dec 2004 09:07:28 -0800, in comp.lang.c ,
wrote:
It is depending upon the hardware.
And the compiler. Think about old DOS compilers.
--
Mark McIntyre
CLC FAQ <http://www.eskimo.com/~scs/C-faq/top.html>
CLC readme: <http://www.ungerhu.com/jxh/clc.welcome.txt>
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