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back to version that uses malloc/free and pointers

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This commit is contained in:
Dan Buch 2011-09-20 14:39:07 -04:00
parent 9d258d22b8
commit f7b89eb28f
1 changed files with 42 additions and 14 deletions
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56
ex16.c
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@ -10,36 +10,64 @@ struct Person {
int weight;
};
void Person_print(struct Person who)
struct Person *Person_create(char *name, int age, int height, int weight)
{
printf("Name: %s\n", who.name);
printf("\tAge: %d\n", who.age);
printf("\tHeight: %d\n", who.height);
printf("\tWeight: %d\n", who.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 main(int argc, char *argv[])
{
// make two people structures
struct Person joe = {"Joe Alex", 32, 64, 140};
struct Person frank = {"Frank Blank", 20, 72, 180};
struct Person *joe = Person_create(
"Joe Alex", 32, 64, 140);
struct Person *frank = Person_create(
"Frank Blank", 20, 72, 180);
// print them out and where they are in memory
printf("Joe is at memory location %p:\n", &joe);
printf("Joe is at memory location %p:\n", joe);
Person_print(joe);
printf("Frank is at memory location %p:\n", &frank);
printf("Frank is at memory location %p:\n", frank);
Person_print(frank);
// make everyone age 20 years and print them again
joe.age += 20;
joe.height -= 2;
joe.weight += 40;
joe->age += 20;
joe->height -= 2;
joe->weight += 40;
Person_print(joe);
frank.age += 20;
frank.weight += 20;
frank->age += 20;
frank->weight += 20;
Person_print(frank);
// destroy them both so we clean up
Person_destroy(joe);
Person_destroy(frank);
return 0;
}