#include <iostream>

extern int count_in_main; // 引用外部程序VariableStorageDesc的全局变量count_in_main

void write_extern(void)
{
   std::cout << "count_in_main is " << count_in_main << ". 此处是调用外部cpp文件VariableStorageDescSupport.cpp输出的结果。" << std::endl; 
}