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

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

// Let's define our structure
typedef struct s1 {
  long ts;
  char location[SIZE];
  int temp;
} Reading;

// --------------------------------------------------
// Here we are passing a COPY of the structure Reading
void modify_copy(Reading r) {

  r.temp = 68;

}

// --------------------------------------------------
// Here we are passing a pointer to a structure Reading
void modify_original(Reading* r) {

  r->temp = 68;

}

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

  Reading item = {10, "XXAAACC", 74}; 
 
  printf("Initial sample is (%ld,%s,%d)\n",item.ts,item.location,item.temp);

  modify_copy(item);
  printf("After modify_copy: (%ld,%s,%d)\n",item.ts,item.location,item.temp);

  modify_original(&item);
  printf("After modify_original: (%ld,%s,%d)\n",item.ts,item.location,item.temp);

  return 0;

}