From 9d258d22b830ea2c93401d2e4ebe79a43f7f8322 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Tue, 20 Sep 2011 14:38:34 -0400
Subject: [PATCH] version of ex16 with structs created on the stack, using dot
 syntax instead of ->, passing by value

---
 ex16.c | 56 ++++++++++++++------------------------------------------
 1 file changed, 14 insertions(+), 42 deletions(-)

diff --git a/ex16.c b/ex16.c
index e586bab..2e505c7 100644
--- a/ex16.c
+++ b/ex16.c
@@ -10,64 +10,36 @@ struct Person {
     int weight;
 };
 
-struct Person *Person_create(char *name, int age, int height, int weight)
+void Person_print(struct Person who)
 {
-    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);
+    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 = Person_create(
-            "Joe Alex", 32, 64, 140);
-
-    struct Person *frank = Person_create(
-            "Frank Blank", 20, 72, 180);
+    struct Person joe = {"Joe Alex", 32, 64, 140};
+    struct Person frank = {"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;
 }