C++历史段错误

1，bzero()误用所致

 struct app_s {
     string name; 
 };

 void printApp(app_s &app) { 
     //访问0地址，段错误
     cout<<app.name<<endl; 
 } 

int main()
{
     app_s app;
     //这里bzero将struct app_s的成员string name初始化为0
     bzero(&app, sizeof(app_s));
     printApp(app)
     return 0; 
} 

#0 0x00007f541cda2853 in std::basic_ostream<char, std::char_traits >& std::operator<< <char, std::char_traits, std::allocator >(std::basic_ostream<char, std::char_traits >&........from /usr/lib/x86_64-linux-gnu/libstdc++.so.6