#include <stdlib.h>
#include <stdio.h>
#include <string.h>

// Let's define a constant
#define SIZE 20

// Let's define a structure with three members (Method 1)
//struct s1 {
//  long ts;
//  char location[SIZE];
//  int temp;
//};

//typedef struct s1 Reading; 

// Shorthand, common use (Method 2)
// This syntax is more commonly used than the one above
typedef struct s2 {
    long ts;
    char location[SIZE];
    int temp;
} Reading;


// --------------------------------------------------
int main(int argc, char* argv[]) {

  // Let's declare variables of type structure 
  //struct s1 item = {10, "XXAAACC", 74};
  //struct s1 array[2];
  //struct s1 *pointer;

  // Or use the follows statements (you need the typedef above)
  Reading item = {10, "XXAAACC", 74}; 
  Reading array[2];
  Reading *pointer;

  // Operating on a variable of type struct sensor_reading
  printf("Initial sample is (%ld,%s,%d)\n",item.ts,item.location,item.temp);

  long time = 20;
  char *location = "EE037";
  int  temp = 67;

  item.ts = time;  
  strncpy(item.location,location,SIZE);
  item.temp = temp;
  
  printf("Updated sample is (%ld,%s,%d)\n",item.ts,item.location,item.temp);


  // Operating on arrays of structures
  array[0].ts = time;
  array[0].temp = temp;
  strncpy(array[0].location,location,SIZE);  
  printf("Element in array is (%ld,%s,%d)\n", array[0].ts, array[0].location,
	 array[0].temp);

  // Using a pointer to a structure
  pointer = &item;

  (*pointer).ts = 30;
  printf("Sample is (%ld,%s,%d)\n",(*pointer).ts,
	 (*pointer).location,
	 (*pointer).temp);

  // The syntax below is more commonly used
  pointer->ts = 40;
  printf("Sample is (%ld,%s,%d)\n",pointer->ts,
	 pointer->location,
	 pointer->temp);

  return 0;

}