diff --git a/ch04-process-memory-structure/ExtremeC_examples_chapter4_5.c b/ch04-process-memory-structure/ExtremeC_examples_chapter4_5.c
index b8c74f1..f6743f3 100644
--- a/ch04-process-memory-structure/ExtremeC_examples_chapter4_5.c
+++ b/ch04-process-memory-structure/ExtremeC_examples_chapter4_5.c
@@ -1,6 +1,6 @@
 // File name: ExtremeC_exampels_chapter4_5.c
 // Description: Example 4.5
 
-int main(int agrc, char** argv) {
+int main(int argc, char** argv) {
   return 0;
 }
diff --git a/ch05-stack-and-heap/ExtremeC_examples_chapter5_3.c b/ch05-stack-and-heap/ExtremeC_examples_chapter5_3.c
index 153acf4..9452fba 100644
--- a/ch05-stack-and-heap/ExtremeC_examples_chapter5_3.c
+++ b/ch05-stack-and-heap/ExtremeC_examples_chapter5_3.c
@@ -4,6 +4,10 @@
 #include <stdio.h>  // For printf function
 #include <stdlib.h> // For C library's heap memory functions
 
+#if defined(__APPLE__) && defined(__MACH__)
+    #include <unistd.h>
+#endif
+
 void print_mem_maps() {
 #ifdef __linux__
   FILE* fd = fopen("/proc/self/maps", "r");
@@ -17,6 +21,11 @@ void print_mem_maps() {
     printf("> %s", line);
   }
   fclose(fd);
+#elif defined(__APPLE__) && defined(__MACH__)
+   char command[256];
+   pid_t pid = getpid();
+   sprintf(command, "vmmap %d", pid); 
+   system(command); 
 #endif
 }
 
diff --git a/ch05-stack-and-heap/ExtremeC_examples_chapter5_6.c b/ch05-stack-and-heap/ExtremeC_examples_chapter5_6.c
index 71686d0..873cd97 100644
--- a/ch05-stack-and-heap/ExtremeC_examples_chapter5_6.c
+++ b/ch05-stack-and-heap/ExtremeC_examples_chapter5_6.c
@@ -58,8 +58,8 @@ int not_friendly_sum(int* matrix, int rows, int columns) {
 int main(int argc, char** argv) {
 
   if (argc < 4) {
-    printf("Usage: %s [print|friendly-sum|not-friendly-sum] ");
-    printf("[number-of-rows] [number-of-columns]\n", argv[0]);
+    printf("Usage: %s [print|friendly-sum|not-friendly-sum] ", argv[0]);
+    printf("[number-of-rows] [number-of-columns]\n");
     exit(1);
   }
   char* operation = argv[1];