vault backup: 2024-11-19 14:10:06

education/software development/ECE1400/Chapter 17 Exercises.md

@@ -1,18 +1,8 @@
-> **1.** Having to check the return function of `malloc` (or any other memory allocation function) each time we call it can be an annoyance. Write a function named `my_malloc` that serves as a "wrapper" for `malloc`. When we call `my_malloc` and ask it to allocate `n` bytes, it in turn calls `malloc`, tests to make sure that `malloc` doesn't return a null pointer, then returns the pointer from `malloc`. Have `my_malloc` print an error message and terminate the program if `malloc` returns a null pointer.
-
+> **4.** Suppose that the following declarations are in effect:
 ```c
-void *my_malloc(size_t n) {
-    void *p = malloc(n);
-    if (p == NULL) {
-	printf("Failed to allocate memory");
-	exit(EXIT_FAILURE);
-    }
-    return p;
-}
+struct point {int x, y; };
+struct rectangle { struct point upper_left, lower_right; };
+struct rectangle *p;
 ```
-
----
-
-> **2.** 
-
+> Assume that we want `p` to point to a rectangle structure whose upper left corner is at $(10, 25)$, and whose lower right corner is at $(20, 15)$. Write a series of statements that allocate such a structure and initialize it as indicated.