/* structDemo2.c: Program to demonstrate the use of pointers to
 * structures. */
#include <stdlib.h>
#include <stdio.h>
#define ALLOC_1D(PNTR, NUM, TYPE) \
 PNTR = (TYPE *)calloc(NUM, sizeof(TYPE)); \
 if (!PNTR) { \
 perror("ALLOC_1D"); \
 fprintf(stderr, \
 "Allocation failed for " #PNTR ". Terminating...\n");\
 exit(-1); \
 }
struct person {
 char *name;
 int age;
 int weight;
};
typedef struct person Person; 
void changePerson2(Person *p);
void showPerson2(Person *p); 
int main() {
 Person *robert, *susan; 
 ALLOC_1D(susan, 1, Person); 
 ALLOC_1D(robert, 1, Person);
 susan->name = "Susan";
 susan->age = 21;
 susan->weight = 120;
 robert->name = "Robert";
 robert->age = 62;
 robert->weight = 180;
 showPerson2(susan);
 
 printf("*** Before changePerson2() ***\n");
 showPerson2(robert);
 changePerson2(robert);
 printf("*** After changePerson2() ***\n");
 showPerson2(robert);
 return 0;
}
/* Function to display the elements in a person. */
void showPerson2(Person *p) {
 printf("name: %s\n", p->name);
 printf("age: %d\n", p->age);
 printf("weight: %d\n", p->weight);
 return;
}
/* Function to modify the elements in a person. */
void changePerson2(Person *p) {
 p->age = p->age - 2;
 p->weight = p->weight - 5;
 printf("*** In changePerson2() ***\n");
 showPerson2(p);
 return;
}
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