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Dec 10th, 2005

Some thingthat we can do in C and Not in C++

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If any body knows it, Pls. post me reply to this

Naveena

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Dec 10th, 2005

Re: Some thingthat we can do in C and Not in C++

C++ can to everything that C can do plus a lot more. There is nothing in C that can't be done by c++.

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Re: Some thingthat we can do in C and Not in C++

Aha... implicit function declarations ! Rather weak thought, but it feels the same as saying something that can not be done in c but in c++, both are complete turing machines and can as such do everything a turing machine can (I heard somewhere that the template language in c++ are also turing complete, interesting side note).

C++ Syntax (Toggle Plain Text)
int main(...)
{
  function( 10 ); 
}
 
...
 
int function( 10 )
{
}
int main(...)
{
  function( 10 ); 
}

...

int function( 10 )
{
}

perniciosus

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Re: Some thingthat we can do in C and Not in C++

>Some thingthat we can do in C and Not in C++
Compile on certain embedded systems.

Narue

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Re: Some thingthat we can do in C and Not in C++

Quote originally posted by Narue ...

>Some thingthat we can do in C and Not in C++
Compile on certain embedded systems.

Yea, but those embdded systems are not ansi C compliant either. There is a different C standard for embedded systems, such is a subset of standard C and embedded systems don't have to use that standard either. Many embedded systems don't support C at all.

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Re: Some thingthat we can do in C and Not in C++

C99:

C++ Syntax (Toggle Plain Text)
int main(void) {
    _Bool b;
    return 0;
}
int main(void) {
    _Bool b;
    return 0;
}

C89:

C++ Syntax (Toggle Plain Text)
int main(void) {
    double x = 1 //**/ 10;
    return 0;
}
int main(void) {
    double x = 1 //**/ 10;
    return 0;
}

For the second program, C++/C99 sees the double line as

(Toggle Plain Text)

double x = 1 //**/ 10;

whereas C89 sees it as

(Toggle Plain Text)

double x = 1 //**/ 10;

dwks

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Re: Some thingthat we can do in C and Not in C++

Quote originally posted by dwks ...

C99:
C++ Syntax (Toggle Plain Text)
int main(void) {
    _Bool b;
    return 0;
}
int main(void) { _Bool b; return 0; }

what is _Bool ? never seen that data type. should it be bool ?

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Re: Some thingthat we can do in C and Not in C++

bool is typedefed as _Bool (which is the actual data type) in <stdbool.h>.

dwks

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