#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
}