Listing 10 3 PointersToStructures

/*Listing 10-3. Using a pointer to structure 

  Purpose: To show the use of pointers to structures
  
  Dr. Purdum, December 21, 2014
*/

struct servicePeople {
  int ID;
  char Name[20];
  char PW[10];
  long Phone;
} myServicePeople, yourServicePeople;

void SetPhoneNumber(struct servicePeople *temp);   // New signature declaration

void setup() {
  Serial.begin(9600);
  Serial.print("myServicePeople lvalue: ");
  Serial.print((int) &myServicePeople);
  Serial.print("  yourServicePeople lvalue: ");
  Serial.println((int) &yourServicePeople);
  yourServicePeople.ID = 205;
  Serial.print("myServicePeople.ID rvalue: ");
  Serial.print(myServicePeople.ID);
  Serial.print("  yourServicePeople.ID rvalue: ");
  Serial.println(yourServicePeople.ID);
  SetPhoneNumber(& myServicePeople);                    // Pass the lvalue
  Serial.println("After assignment:");
  Serial.print("myServicePeople.ID rvalue: ");
  Serial.print(myServicePeople.ID);
  Serial.print("  yourServicePeople.ID rvalue: ");
  Serial.println(yourServicePeople.ID);
  Serial.print("A servicePerson structure takes ");
  Serial.print(sizeof(servicePeople));
  Serial.println(" bytes of storage.");
  Serial.print("myServicePeople.Phone rvalue: ");  // New
  Serial.println(myServicePeople.Phone);             // New 
  Serial.print("yourServicePeople.Phone rvalue: ");
  Serial.println(yourServicePeople.Phone);
}
void loop(){
}

// Lines below are changed
void SetPhoneNumber(struct servicePeople *temp)    // Note pointer now used
{
  (*temp).Phone = 2345678;
}