Sub: Update test_static.c

Body:

==== End ====

snippet/cpp/test_static.c

@@ -3,11 +3,18 @@
 
 typedef struct {
     long long id;
-    char *name;
+    char name[30];
-    char *desc;
+    char desc[400];
     int age;
 } Person;
 
+typedef struct {
+    long long id;
+    char *title;
+    char *desc;
+    int version;
+} SmallObj;
+
 void test () {
     static int num = 0;
     num++;
@@ -24,24 +31,28 @@ void test2() {
 int main(int argc, char **argv) {
     // p is on stack, while q is on heap
     Person p;
-    Person *q = (Person *)malloc(sizeof(Person));
+    Person *q = (Person *) malloc(sizeof(Person));
     if (q == NULL) {
         printf("malloc fails\n");
         return -1;
     }
 
+    SmallObj o;
+    SmallObj *r = (SmallObj *) malloc(sizeof(SmallObj));
+
     // test();
     // test();
     // test2();
     // test2();
     /**
-     * TODO: 看起来操作系统决定 malloc 申请的内存在哪里
      * Output on linux64 compiled by clang
-     * addr of p: 0x5619048df2d0, addr of q: 0x7fb51f2e19e0
+     * addr of p: 0x7ffc94fcaf58, addr of q: 0x565297e022a0, addr of o: 0x7ffc94fcaf38, addr of r: 0x565297e02470
      * Output on win64 compiled by MinGW64 gcc
      * addr of p: 000000B0591FFB20, addr of q: 000000B0591FFB00
      */
-    printf("addr of p: %p, addr of q: %p\n", p, *q);
+    printf("addr of p: %p, addr of q: %p, addr of o: %p, addr of r: %p\n", 
+           &p, q, &o, r);
     free(q);
+    free(r);
     return 0;
 }