1 files changed, 20 insertions, 15 deletions
diff --git a/main.c b/main.c
index ad5174c..83bf64d 100644
--- a/main.c
+++ b/main.c
@@ -2,22 +2,27 @@
 #include <string.h>
 #include <stdlib.h>
 
+typedef struct {
+  int age;
+  int happiness; // 0 sad, 100 happy
+} Person;
+
+void slide(Person *person)
+{
+  person->happiness += 10;
+}
+
+// pass by value
+// pass by reference
 int main(int argc, char *argv[])
 {
-  // AND &&
-  // OR ||
-  //
-  int age = 30;
+  Person *mo = malloc(sizeof(Person));
+  mo->age = 36;
+  mo->happiness = 70;
 
-  if (/* */)
-  {
-    printf("Fly to Hawaii\n");
-  }
-  else
-  {
-    printf("Camp in the back yard\n");
-  }
-}
+  printf("Before: age(%d), happiness(%d)\n", mo->age, mo->happiness);
+
+  slide(mo);
 
-// 1. compile: c -> machine
-// 2. run: machine -> os
+  printf("After: age(%d), happiness(%d)\n", mo->age, mo->happiness);
+}