A file a.cpp & B.cpp are complied & linked together in VC++ file a is s

A file a.cpp & B.cpp are complied & linked together in VC++
file a is something like int a =100;, File B is something
like extern a;
main()
{
printf("%d",a);
}what will be the output.a)100,b)linker error,c)complier
error etc etc.

Question Posted / archana

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A file a.cpp & B.cpp are complied & linked together in VC++ file a is something like int a ..

Answer / shankar

Take an example, if you are working on a C++ project but it
also deals with some existing C functions/libraries.
You want to wrap them in a C++ module or compile them with
other C++ objects without any C++ compiler errors, then you
would declare the C function prototypes in an extern "C"
block to notify the compiler that they would be compiled
along with other C++ functions into one module.

For example:

my_C_CPP_Header.h:

#ifndef MY_C_CPP_HEADER
#define MY_C_CPP_HEADER

/*check if the compiler is of C++*/
#ifdef __cplusplus
extern "C" {
int myOtherCfunc(int arg1, int arg2); /* a C function */
}
#endif

void myCppFunction1(); /* C++ function */
void myCppFunction2(); /* C++ function */

/*check if the compiler is of C++ */
#ifdef __cplusplus
}
#endif

#endif

Now all three functions are comiled into one module by C++
compiler.

So the out put is (a)100.

Is This Answer Correct ?

7 Yes

0 No

A file a.cpp & B.cpp are complied & linked together in VC++ file a is something like int a ..

Answer / ashish chandrakar

It should be compiler 1 compiler error and 1 warning
Error : Undeclared identifier
we have to include stdio.h
Warning: main should return a value; but it assume as return
type as void.

Is This Answer Correct ?

1 Yes

3 No

A file a.cpp & B.cpp are complied & linked together in VC++ file a is something like int a ..

Answer / zerozero

Compiler error

Is This Answer Correct ?

0 Yes

5 No

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