Using pointers to access previously sheltered variables

ex22.c

@@ -13,12 +13,29 @@ int get_age()
 }
 
 
+int *get_age_pointer()
+{
+    return &THE_AGE;
+}
+
+
 void set_age(int age)
 {
     THE_AGE = age;
 }
 
 
+double *get_function_static(double to_add)
+{
+    static double value = 1.0;
+
+    double old = value;
+    value = value + to_add;
+
+    return &value;
+}
+
+
 double update_ratio(double new_ratio)
 {
     static double ratio = 1.0;

ex22.h

@@ -6,6 +6,8 @@ int THE_SIZE;
 
 // gets and sets an internal static variable in ex22.c
 int get_age();
+int * get_age_pointer();
+double * get_function_static(double);
 void set_age(int age);
 
 // updates a static variable that's inside update_ratio

ex22_main.c

@@ -31,6 +31,13 @@ int main(int argc, char *argv[])
 
     log_info("My age is now: %d", get_age());
 
+    int new_age = 44;
+    log_info("Setting age directly to %d", new_age);
+    int *age = get_age_pointer();
+    *age = new_age;
+
+    log_info("My age is now: %d", get_age());
+
     // test out THE_SIZE extern
     log_info("THE_SIZE is: %d", THE_SIZE);
     print_size();
@@ -45,6 +52,15 @@ int main(int argc, char *argv[])
     log_info("Ratio again: %f", update_ratio(10.0));
     log_info("Ratio once more: %f", update_ratio(300.0));
 
+    // accessing a function static
+    double *func_static_value = get_function_static(4.0);
+    log_info("get_function_static(4.0) = %.1f", *func_static_value);
+    double new_func_static_value = 8.0;
+    log_info("Setting the function static var directly to %.1f",
+            new_func_static_value);
+    *func_static_value = new_func_static_value;
+    log_info("get_function_static(4.0) = %.1f", *get_function_static(4.0));
+
     // test the scope demo
     int count = 4;
     scope_demo(count);