adding example to using malloc to create a one-dimensional array

c_pointers/chapter_4.c

@@ -5,7 +5,9 @@
 int main(void) {
 
     int vector[5] = {1,2,3,4,5};
-    int *pv = vector;
+    int *pv;
+
+    pv = vector;
 
     printf("length of vector: %zu\n", sizeof(vector)/sizeof(int));
 
@@ -16,18 +18,33 @@ int main(void) {
             index, &matrix[index], index, sizeof(matrix[index]));
     }
 
+    // pointer notation and arrays
     int value = 3;
     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++) {
         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++)
+    {
+        pv[i] = i + 1;
+    }
+    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]);
+    }
+
     return 0;
 
 }