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char() vs (char)

Posted on 2004-10-06
6
Medium Priority
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Last Modified: 2010-04-24
win2k, vc++6.0

What is the different between :
DWORD dw;
char a = char(dw);
char b = (char)dw;

Is char() a marco or a function?
which *.h file can i found its definition?
Thank you very much.
Rgds.
Alan
--END
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Question by:alanpong
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6 Comments
 
LVL 16

Expert Comment

by:nonubik
ID: 12236750
'char' is a type

The char type is used to store the integer value of a member of the representable character set. That integer value is the ASCII code corresponding to the specified character.

>char b = (char)dw;
here you used the cast operator (see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/vcrefCastOperator.asp)
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Author Comment

by:alanpong
ID: 12237232
i know (char)dw is a casting.

how about this?
char a = char(dw);

is char( X ) a marco or function?
or standard c++ usage?

is char(dw) equalivent to (char) dw?

--END
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LVL 16

Expert Comment

by:nonubik
ID: 12237379
>is char(dw) equalivent to (char) dw?

>char a = char(dw);
it's like you call the constructor of a class with a value
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LVL 1

Author Comment

by:alanpong
ID: 12237423
>it's like you call the constructor of a class with a value
can i found its definition in .h file?

(char)dw should be faster than char(dw)?

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Accepted Solution

by:
nonubik earned 200 total points
ID: 12237587
>(char)dw should be faster than char(dw)?
it's the same

>can i found its definition in .h file?
'char' is a fundamental data type. It does not have a definition in an external file. (i.e. .h)
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LVL 1

Author Comment

by:alanpong
ID: 12237732
>>(char)dw should be faster than char(dw)?
>it's the same

struct s
{
  int z;
} s;

char c = (char) s;
char d = char(s);

yes, proved, the compiler tell me both assignments above is trying to do type casting.
error C2440: 'type cast' : cannot convert from 'struct s' to 'char'
error C2440: 'type cast' : cannot convert from 'struct s' to 'char'
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