#include <string.h>
#include <iostream>
using namespace std;

typedef struct {
  char name[32];
  char age;
} person_t;

void set_age(person_t * const p, int age) {
  p->age = age;  // this is OK
  //p++;         // this is not allowed!
}

int get_age(const person_t * const p) {
  //p->age++;  // this is not allowed!
  //p++;    // this is not allowed!
  return p->age;  // this is OK
}

int main() {
  person_t peter;
  strcpy(peter.name, "Peter Smith");
  set_age(&peter, 25);
  std::cout << "Age of" << peter.name << " is " << get_age(&peter) << endl;
}