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May 6th, 2004

How do you write a code which compiles in c but not in c++?

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How am i supposed to write a code in c which compiles in c but not in c++
plz do let me know

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prabhu_kar

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May 6th, 2004

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Re: How do you write a code which compiles in c but not in c++?

c++ is a subset of c, or maybe it's the otehr way round i 4got that crap, but anyhow, piont is, u can't.

infamous

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Re: How do you write a code which compiles in c but not in c++?

This Right YOu can't do that coz C is subset of C++ ...

meabed

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Re: How do you write a code which compiles in c but not in c++?

>How am i supposed to write a code in c which compiles in c but not in c++

C++ Syntax (Toggle Plain Text)
#include <stdio.h>
 
int main(void)
{
char new[] = "Compiles in C, not in C++";
puts(new);
return 0;
}
#include <stdio.h>
 
int main(void)
{
char new[] = "Compiles in C, not in C++";
puts(new);
return 0;
}

That is, one way would be to use a C++ (and not C) keyword as a variable.

[EDIT]
Another way.

(Toggle Plain Text)

#include <stdio.h>
 
#ifdef __cplusplus
#error Prevented from compiling as C++
#endif
 
int main(void)
{
puts("Hello world");
return 0;
}

[/EDIT]

Dave Sinkula

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long time no c

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Re: How do you write a code which compiles in c but not in c++?

LOL good thinking

infamous

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Re: How do you write a code which compiles in c but not in c++?

Hi,

C++ is a superset of C.

I can only wonder WHY you would want to try to compile something that works with C only? That doesn't make sense.

Christian

kc0arf

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Re: How do you write a code which compiles in c but not in c++?

Quote originally posted by kc0arf ...

Hi,

C++ is a superset of C.

I can only wonder WHY you would want to try to compile something that works with C only? That doesn't make sense.

Christian

I seemed to remember reading about some incompatibilities that were valid C and not C++ code after doing a few minutes googling I found this link:

http://david.tribble.com/text/cdiffs.htm

Whilst most of the incompatibilities exist only in theory between the ISO99 standard C and C++ there does exist some problems such as:

C++ Syntax (Toggle Plain Text)
extern int foo();
 
void main()
{
   foo(1,2);
}
extern int foo();

void main()
{
   foo(1,2);
}

Is valid C but will cause an error in C++, in 2 places with g++ since main must return an int, and there is too many arguements passed in foo, in C it is assumed that extern int foo() calls a function with an unspecified number of arguements where as C++ assumes it is called a function with no arguements ie: extern int foo(void)

So whilst there shouldn't be incompatibilities some do exist due to language evolution.

Btw most of the incompatibilities on the link included are theoretical also with some compilers the incompatibility I have shown will be detected with others it won't according to the standard it is invalid C++ but valid C, and when I tested this will gcc and g++ it showed the problem.

HTH
Ben

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Re: How do you write a code which compiles in c but not in c++?

LOL .. Nice

meabed

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May 11th, 2004

Re: How do you write a code which compiles in c but not in c++?

Quote originally posted by The Other Dave ...

>How am i supposed to write a code in c which compiles in c but not in c++
C++ Syntax (Toggle Plain Text)
#include <stdio.h>
 
int main(void)
{
char new[] = "Compiles in C, not in C++";
puts(new);
return 0;
}
#include <stdio.h> int main(void) { char new[] = "Compiles in C, not in C++"; puts(new); return 0; }
That is, one way would be to use a C++ (and not C) keyword as a variable.

[EDIT]
Another way.
(Toggle Plain Text)
#include <stdio.h>
 
#ifdef __cplusplus
#error Prevented from compiling as C++
#endif
 
int main(void)
{
puts("Hello world");
return 0;
}
#include <stdio.h> #ifdef __cplusplus #error Prevented from compiling as C++ #endif int main(void) { puts("Hello world"); return 0; }
[/EDIT]

Is that all?
Or r there any more?
Can u give me if any plz

prabhu_kar

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