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Feb 17th, 2007
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Re: Range of int

I have never seen a byte defined by anything other than 8 bits, although I don't thinnk the c or c++ standards specify its size. Here is just one of many examples.
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Feb 17th, 2007
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Re: Range of int

Click to Expand / Collapse  Quote originally posted by Narue ...
>Byte is not defined as 8 bits then what is it defined as?
It's defined as whatever the implementation wants. The standard only specifies that sizeof ( char ) be 1, and at least 8 bits. That happens to be the most common definition of a byte, but systems other than your PC also support C and don't have the same definition.
So if you had an architecture that was word addressed rather than byte addressed, it wouldn't be surprising for sizeof(char) to be 1, yet that it would be 32 bits? Or is it determined by the actual implementation of your C library?
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Feb 17th, 2007
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Re: Range of int

>it wouldn't be surprising for sizeof(char) to be 1, yet that it would be 32 bits?
Sure, why not?

>Or is it determined by the actual implementation of your C library?
It's determined by the compiler, not the library. Internally, a compiler will typically match the hardware for performance reasons, and the library would be written to match the compiler.
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Feb 18th, 2007
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Re: Range of int

Hi friend.
This is goutham from India.
Ur doubt is that why is char range -128 in the negative side.
The most significant bit is sign bit.
So the bits available for storing magnitude is 7.
If sign bit is 0,the number is positive and the magnitude is stored in conventional binary form.
If sign bit is 1,the number is negative and the magnitude is stored in two's complement form.
For example, +1 is stored as 00000001.
-1 is sored as 11111111.
-128 gets 10000000.

If u still cant get it reply me.
bye
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Feb 19th, 2007
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Re: Range of int

Click to Expand / Collapse  Quote originally posted by Ancient Dragon ...
I have never seen a byte defined by anything other than 8 bits, although I don't thinnk the c or c++ standards specify its size.
I have. They do: CHAR_BIT.
Click to Expand / Collapse  Quote originally posted by Ancient Dragon ...
Here is just one of many examples.
I'll stick with the C and C++ definitions. 'Cuz I've been bitten where it can bite.
Last edited by Dave Sinkula; Feb 19th, 2007 at 3:15 am.
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Feb 19th, 2007
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Re: Range of int

Click to Expand / Collapse  Quote originally posted by Dave Sinkula ...
I have. They do: CHAR_BIT
No Dave, thats a macro, actual value of that macro is defined by the compiler.

Click to Expand / Collapse  Quote originally posted by Dave Sinkula ...
.I'll stick with the C and C++ definitions. 'Cuz I've been bitten where it can bite.
Agree. When a program must know the number of bits in a byte then use the CHAR_BIT macro.
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This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.
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