第九章完结

Chapter9/malloc.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int *p = NULL;
+
+    p = malloc(sizeof(int));
+    if (NULL == p)
+    {
+        printf("malloc() error!\n");
+        exit(1);
+    }
+
+    *p = 10;
+
+    printf("%p-->%d\n", *p);
+
+    free(p);
+    p = NULL;   // !important
+
+    printf("%p-->%d\n", *p);
+    // 0x5a677368 -- > 1516729192
+
+    *p = 123;
+    printf("%p-->%d\n", *p);
+    // 0x7b -- > 0
+
+    exit(0);
+}