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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.
- 3 Answers
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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 |
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 |
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