#include <iostream>
#include <string>
using std::string;

string s;                 // DEFINES s to be the empty string.
int i = 5;                // DEFINES i as an int variable initialized to 5

struct Date{              // DEFINES Date to be a type (struct) with three
  int d, m, y;            // int fields: d, m, and y
};  

int f(int i){             // DEFINES f to a particular function from
  return i + 1;           // int to int
}

extern string t;          // DECLARES that t is a string
extern int j;             // DECLARES that j an int
struct DateWithWeekday;   // DECLARES that DateWithWeekday is a struct - forward declaration
int g(int i);             // DECLARES that g is an int returning function of int

DateWithWeekday 
           h(Date, int);  // DECLARES function h from Date and int to DateWithWeekday

struct DateWithWeekday{   // DEFINES an already forwardly declared type
  Date wd;                
  int weekday;
};

int func()                // DEFINES a parameterless function func
{
  Date d1 = Date();
  DateWithWeekday 
      dwd1,
      dwd2 = h(d1, 3);

  f(i);
  g(j);
}