Difference of cast between c++ and c# ?

  • Thread starter Thread starter Scotty
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Scotty

Hi,

If I do a (char)-1 in c++ and c# I get a different result: 'ÿ' and '.'

Why is that please ?
 
Scotty said:
Hi,

If I do a (char)-1 in c++ and c# I get a different result: 'ÿ' and '.'

Why is that please ?
Click to expand...

What character set defines characters associated with negative numeric
values?

If you cast a defined value, do you get the same result in both languages?

By C++, are you referring to ISO standard or C++/CLI?

Bottom line: different languages provide different responses to illogical
input.
 
Scotty said:
Hi,

If I do a (char)-1 in c++ and c# I get a different result: 'ÿ' and '.'

Why is that please ?
.
Click to expand...

First, your code would have been:

char c = unchecked((char) -1);

to avoid a compiler error. That would tell you something is amiss.

As PvdG42 wrote, the behavior is rather ill-defined. In fact, when I run
the code above, I get a question mark for any negative number.

Mike
 
If I do a (char)-1 in c++ and c# I get a different result: 'ÿ' and '.'
Why is that please ?
Click to expand...

Maybe because 'char' is 8 bits in C++ and 16 bits in C#?
C++: -1 (255) results in (ANSI-Codepage) in 'ÿ'
C#: -1 (65535) results in an illegal Unicode character.
 
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