[c-prog] Help - extern variable not recognized.

[sadhanavs]

Hi,

 I have two files extern_function.c and extern_file.c.

// extern_file.c

  int x =20;
  int getData()
  {
   return 20;
  }

// extern_function.c

extern int getValue();
extern int k;
int main()
{

 printf("%d\n", getValue());
 getInput();
 return 0;

}

int getInput(){
   printf(" Value:-%d ",k);
   return 0;
}

i compile it using gcc.

gcc extern_file.c extern_function.c
Undefined                       first referenced
 symbol                             in file
k                                   /var/tmp//ccctm19K.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

Why is that the function getValue() works with extern and not k?
I commented out the printf("%d",k);
Is there something else i need in order to get the object files linked?

Thanks
Sadhana