From: "Fernando Arturo G�mez Flores"
>From: Paul Herring
>> From: au veer [mailto:[EMAIL PROTECTED]
>>
>> [facetious answers to blatant homework questions=...]
[...]
>> >5. Is there something we can do in C but not in C++.
>>
>> Yes.
>>
>> >6. Difference Between Struct and Class.( atleast 2
>> >example)
>>
>> 1) the spelling
>> 2) the number of letters.
>>
>> One thing they have in common is that neither is a keyword
>> in C++ (or C for that matter) - neither should have a capital
>> letter in them.
[...]
>
>Hi,
>
>Answer to point five was unexpected to me. I thought that
>everything that
>you can do in C, you can do it also in C++. What are those things?
In the following two examples, the source code is identical - merely compiled
(or attempted) as either C or C++
Declare variable names that are keyword in C++ but not C.
=========================================================
$ type cpp.cpp
#include <stdio.h>
int main(void){
int old, new=3;
return 0;
}
$ make
cl cpp.cpp /EHs /Zc:forScope /Wall /W4 /WL /wd4820 /wd4619 /wd4217 /wd4710
/wd4668 /c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.10.3077 for 80x86
Copyright (C) Microsoft Corporation 1984-2002. All rights reserved.
cpp.cpp
cpp.cpp(3) : error C2059: syntax error : 'new'
make: *** [cpp.obj] Error 2
$ type c.c
#include <stdio.h>
int main(void){
int old, new=3;
return 0;
}
$ make
cl c.c /EHs /Zc:forScope /Wall /W4 /WL /wd4820 /wd4619 /wd4217 /wd4710 /wd4668
/c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.10.3077 for 80x86
Copyright (C) Microsoft Corporation 1984-2002. All rights reserved.
c.c
c.c(3) : warning C4101: 'old' : unreferenced local variable
c.c(3) : warning C4189: 'new' : local variable is initialized but not referenced
link c.obj /OUT:c.exe /nologo
$
Assume sizeof('a')==4:
======================
$ type c.c
#include <stdio.h>
int main(void){
printf("%d", sizeof('a'));
return 0;
}
$ c
4
$ type cpp.cpp
#include <stdio.h>
int main(void){
printf("%d", sizeof('a'));
return 0;
}
$ cpp
1
>And about point six, another difference, I think, is that by default, a
>class' members are private, wheras the struct's members are public.
I was refraining from giving too-useful answers in reply to the original post ;)
--
PJH
"...one of the main causes of the fall of the Roman Empire was that, lacking
zero, they had no way to indicate successful termination of their C programs."
- Robert Firth
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