Automatic (Function Scope) Variables


The new home for Visual Studio documentation is Visual Studio 2017 Documentation on

The latest version of this topic can be found at Automatic (Function Scope) Variables.

A variable declared within a function can only be used within the scope of that function.

// LNK2019_AV.cpp  
// compile with: /c  
void test(void);  
static int lnktest3 = 3;  
int lnktest4 = 4;  
int main() {  
   static int lnktest1 = 1;  
   int lnktest2 = 2;  

and then,

// LNK2019_AV_2.cpp  
// compile with: LNK2019_AV.cpp  
// LNK2019 expected  
extern int lnktest1;  
extern int lnktest2;  
extern int lnktest3;  
extern int lnktest4;  
void test(void) {  
   int i = 0;  
   i = lnktest1;  
   i = lnktest2;  
   i = lnktest3;  
   i = lnktest4;   // OK  

Linker Tools Error LNK2019