C++默认值。

类成员变量：

char :�　　　　　　//随机
int :2685372　　　　//随机
string :size:0length:0 
vector :0
map :0

结构体　　//取决于成员自己的类型

类成员静态变量： == 全局变量

char :
int :0
string :size:0length:0
vector :0
map :0

struct AAA1
{
    int i;
    char c[];
};

class AAAA2
{
public:
    static AAA1 aaa1;
    static std::string s;
    static std::vector<int> v;
    static std::map<int ,int> m;
};

AAA1 AAAA2::aaa1;
std::string AAAA2::s;
std::vector<int> AAAA2::v;
std::map<int ,int> AAAA2::m;
TEST(INIT,INIT)
{
    AAAA2 aaaa2[];

    for (int i = ; i < ; ++i) {
        std::cout << "char :" << AAAA2::aaa1.c[] << std::endl;
        std::cout << "int :" << AAAA2::aaa1.i << std::endl;
        std::cout << "string :" << AAAA2::s << "size:"<< AAAA2::s.size() << "length:"<< AAAA2::s.length() << std::endl;
        std::cout << "vector :" << AAAA2::v.size() << std::endl;
        std::cout << "map :" << AAAA2::m.size() << std::endl;
    }

}