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Home » Extra libraries, Code snippets, applications etc. » C++ language problems and code snippets » Time for little quiz!
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Re: Time for little quiz! [message #17891 is a reply to message #2295] |
Tue, 02 September 2008 00:04 |
nixnixnix
Messages: 415 Registered: February 2007 Location: Kelowna, British Columbia
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Senior Member |
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ok I am not quite up to understanding the full consequences of the above conversation. However, the bit (excuse the pun) that interests me is:
how many bits does an "int" have when I compile on a 64 bit OS (linux or vista - I am trying both)?
If I want my documents to load and save (using Serialize(Stream&)) between 32 and 64 bit implementations of my software, do I need to replace all "int" with "int32"? I am guessing this is so but what else will I need to change please?
char is still 16 bit right?
float is always 32 bit right?
double is always 64 bit right?
what about bool?
what about String?
Nick
[Updated on: Tue, 02 September 2008 00:06] Report message to a moderator
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Re: Time for little quiz! [message #17892 is a reply to message #17891] |
Tue, 02 September 2008 08:56 |
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mirek
Messages: 13975 Registered: November 2005
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Ultimate Member |
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[quote title=nixnixnix wrote on Mon, 01 September 2008 18:04]ok I am not quite up to understanding the full consequences of the above conversation. However, the bit (excuse the pun) that interests me is:
how many bits does an "int" have when I compile on a 64 bit OS (linux or vista - I am trying both)?
If I want my documents to load and save (using Serialize(Stream&)) between 32 and 64 bit implementations of my software, do I need to replace all "int" with "int32"? I am guessing this is so but what else will I need to change please?
[quote]
It "depends".
With x86-64, int is still 32 bits. And in fact, AFAIK, this is the most common arrangement for 64-bit systems.
To get "true" 64-bit integer, types vary more, but with U++, you can just use "int64".
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char is still 16 bit right?
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char is always 8 bit.
wchar is now 16 bit, but it seems like we have to go 32-bit soon. But that should not affect the existing code too much.
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float is always 32 bit right?
double is always 64 bit right?
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Yes.
Frankly, I do not know But I believe it is 1 for both GCC and MSC.
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what about String?
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Current implementation 16. May change (before 2007, it was equal to sizeof(void*)).
Mirek
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