c++中struct使用注意事项

#include<iostream>#include<string>using namespace std;struct test{  int num;  string name;};int main(void){  test t;  t.num=1;  t.name="jack";  cout<<t.num<<" "<<t.name<<endl;    }

int main(void){  struct test{    int num;  };    test hello;//right  }void t(){  test t; //wrong}