如何使指向全局结构数组的指针

I have this code :

我有这个代码：

#define N 100  //starting size of the array

int is_full(VERTEX *arr);
int add_vertex(char *name);
int print_degree(int ID);
int _get_vertex(int ID);
VERTEX *resize_array(VERTEX *vertex_array,int new_size);

VERTEX *arr = (VERTEX*)calloc(N, sizeof(VERTEX)); // dynamic allocation and initialization to NULL
 
 
I have this code :
 
 
我有这个代码：
 
 
#define N 100  //starting size of the array

int is_full(VERTEX *arr);
int add_vertex(char *name);
int print_degree(int ID);
int _get_vertex(int ID);
VERTEX *resize_array(VERTEX *vertex_array,int new_size);

VERTEX *arr = (VERTEX*)calloc(N, sizeof(VERTEX)); // dynamic allocation and initialization to NULL\0

int main(void)
{
    int vertex_counter = 0 ;
    int starting_size_of_array = sizeof(VERTEX)*N;
}
 
 
I get the error : error C2099: initializer is not a constant
 
 
我收到错误：错误C2099：初始化程序不是常量
 
 
I want the VERTEX array to be global - in order for me to access this array anywhere . so how come it's not constant? N is under #define , and VERTEX has it's declaration in th .h file.
 
 
我希望VERTEX数组是全局的 - 以便我可以在任何地方访问这个数组。那怎么来不恒定呢？ N在#define下，VERTEX在.h文件中有声明。
 
  
  
 
2 个解决方案
 
 
 
  
#1
 
  
 
  
 
   
3  
 
   
First off, the initialiser isn’t a constant. You need to initialise the global from within a function – e.g. main:
 
   
首先，初始化器不是常量。您需要在函数内初始化全局 - 例如主要：
 
   
VERTEX *arr;

int main(void)
{
    arr = (VERTEX*)calloc(N, sizeof(VERTEX));
}
 
   
But you should not use globals in the first place, if avoidable (and it usually is). It destroys your code design.
 
   
但是如果可以避免的话，你不应该首先使用全局变量（通常是这样）。它破坏了你的代码设计。
 
  
 
 
 
 
 
  
#2
 
  
 
  
 
   
0  
 
   
The value calloc() will return is not constant. You can init arr to NULL then initialize it during your program start up.
 
   
calloc（）返回的值不是常量。您可以将init arr设置为NULL，然后在程序启动期间初始化它。
 
  
 
 
 



int main(void)
{
    int vertex_counter = 0 ;
    int starting_size_of_array = sizeof(VERTEX)*N;
}
#define N 100  /