From ed5721dcb096300a64d1bece4cb66be0b8771a6b Mon Sep 17 00:00:00 2001
From: tmeissner <programming@goodcleanfun.de>
Date: Wed, 9 Apr 2014 23:59:04 +0200
Subject: [PATCH] more examples up to chapter 'using one-dimensional array of
 pointers'

---
 c_pointers/chapter_4.c | 51 +++++++++++++++++++++++++++++++++++++-----
 1 file changed, 45 insertions(+), 6 deletions(-)

diff --git a/c_pointers/chapter_4.c b/c_pointers/chapter_4.c
index 3b7c714..1dae1af 100644
--- a/c_pointers/chapter_4.c
+++ b/c_pointers/chapter_4.c
@@ -2,6 +2,28 @@
 #include <stdio.h>
 
 
+void displayArray(int arr[], size_t size);
+void displayArrayPtr(int *arr, size_t size);
+
+
+void displayArray(int arr[], size_t size) {
+    for (size_t i = 0; i < size; i++) {
+        // both variants are possible
+        printf("%d\n", arr[i]);
+        //printf("%d\n", *(arr + i));
+    }
+}
+
+
+void displayArrayPtr(int *arr, size_t size) {
+    for (size_t i = 0; i < size; i++) {
+        // both variants are possible
+        printf("%d\n", *(arr + i));
+        //printf("%d\n", arr[i]);
+    }
+}
+
+
 int main(void) {
 
     int vector[5] = {1,2,3,4,5};
@@ -20,31 +42,48 @@ int main(void) {
 
     // pointer notation and arrays
     int value = 3;
-    for(size_t index = 0; index < sizeof(vector)/sizeof(int); index++) {
+    for (size_t index = 0; index < sizeof(vector)/sizeof(int); index++) {
         // all following operations are equivalent
         *pv++ *= value;
         //pv[index] *= value;
         //*(pv + index) *= value;
         //vector[index] *= value;
     }
-    for(size_t index = 0; index < sizeof(vector)/sizeof(int); index++) {
+    for (size_t index = 0; index < sizeof(vector)/sizeof(int); index++) {
         printf("vector[%zu]: %d\n", index, vector[index]);
     }
 
     // using malloc to create a one-dimensional array
     pv = (int*) malloc(5 * sizeof(int));
-    for (size_t i = 0; i < 5; i++)
-    {
+    for (size_t i = 0; i < 5; i++) {
         pv[i] = i + 1;
     }
-    for (size_t i = 0; i < 5; ++i)
-    {
+    for (size_t i = 0; i < 5; ++i) {
         *(pv + i) = i + 1;
     }
     for(size_t index = 0; index < 5; index++) {
         printf("pv[%zu]: %d\n", index, pv[index]);
     }
 
+    // passing array to function using array notation
+    displayArray(vector, sizeof(vector)/sizeof(int));
+
+    // passing array to function using pointer notation
+    displayArrayPtr(vector, sizeof(vector)/sizeof(int));
+
+
+    // using one-dimensional array of pointers
+    {
+        int *arr[5];
+        for (size_t i = 0; i < 5; i++) {
+            // both variants are equivalent
+            arr[i] = (int*) malloc(sizeof(int));
+            *arr[i] = i;
+            //*(arr + i) = (int*) malloc(sizeof(int));
+            //**(arr + i) = i;
+        }
+    }
+
     return 0;
 
 }
\ No newline at end of file