#include
#include
#include
struct Person {
char *name;
int age;
int height;
int weight;
};
struct Person *Person_create(char *name, int age, int height, int weight)
{
struct Person *who = malloc(sizeof(struct Person));
assert(who != NULL);
who->name = strdup(name);
who->age = age;
who->height = height;
who->weight = weight;
return who;
}
void Person_destroy(struct Person *who)
{
assert(who != NULL);
free(who->name);
free(who);
}
void Person_print(struct Person *who)
{
printf("Name: %s\n", who->name);
printf("\tAge: %d\n", who->age);
printf("\tHeight: %d\n", who->height);
printf("\tWeight: %d\n", who->weight);
}
{
//
int ages[]
struct Person *joe =
char *names[]
"Joe Alex", 32, 64, 140);
struct Person *frank =
"Alan", "Frank",
"Mary", "John", "Lisa"
};
struct Person *frank = Person_create(
"Frank Blank", 20, 72, 180);
//
int count = sizeof(ages) / sizeof(int);
int i = 0;
printf("Joe is at memory location %p:\n", joe);
Person_print(joe);
printf("Frank is at memory location %p:\n", frank);
Person_print(frank);
//
for(i = 0; i < count; i++) {
printf("%s has %d
names[i], ages[i]);
}
printf("---\n");
joe->age += 20;
joe->height -= 2;
joe->weight += 40;
Person_print(joe);
frank->age += 20;
frank->weight += 20;
Person_print(frank);
//
int *cur_age = ages;
char **cur_name = names;
// second way using pointers
for(i = 0; i < count; i++) {
printf("%s is %d years old.\n",
*(cur_name+i), *(cur_age+i));
}
printf("---\n");
// third way, pointers are just arrays
for(i = 0; i < count; i++) {
printf("%s is %d years old again.\n",
cur_name[i], cur_age[i]);
}
printf("---\n");
// fourth way with pointers in a stupid complex way
for(cur_name = names, cur_age = ages;
for(cur_name = names, cur_age = ages;
(cur_age - ages) < count;
cur_name++, cur_age++)
{
printf("%s lived %d years
*cur_name, *cur_age);
}
Person_destroy(joe);
Person_destroy(frank);
return 0;
}