switching for-loops to while-loops

ex15.c

@@ -5,9 +5,10 @@ void print_with_array_indexing(int count, char **names, int *ages)
     int i = 0;
 
     // first way using indexing
-    for(i = 0; i < count; i++) {
+    while(i < count) {
         printf("%s has %d years alive.\n",
                 names[i], ages[i]);
+        i++;
     }
 
     printf("---\n");
@@ -15,15 +16,16 @@ void print_with_array_indexing(int count, char **names, int *ages)
 
 void print_with_pointer_arithmetic(int count, char **names, int *ages)
 {
-    int i;
+    int i = 0;
     // setup the pointers to the start of the arrays
     int *cur_age = ages;
     char **cur_name = names;
 
     // second way using pointers
-    for(i = 0; i < count; i++) {
+    while(i < count) {
         printf("%s is %d years old.\n",
                 *(cur_name+i), *(cur_age+i));
+        i++;
     }
 
     printf("---\n");
@@ -31,13 +33,14 @@ void print_with_pointer_arithmetic(int count, char **names, int *ages)
 
 void print_with_pointers_as_arrays(int count, char **names, int *ages)
 {
-    int i;
+    int i = 0;
     int *cur_age = ages;
     char **cur_name = names;
     // third way, pointers are just arrays
-    for(i = 0; i < count; i++) {
+    while(i < count) {
         printf("%s is %d years old again.\n",
                 cur_name[i], cur_age[i]);
+        i++;
     }
 
     printf("---\n");
@@ -50,12 +53,9 @@ void print_in_stupidly_complex_way(int count, char **names, int *ages)
     char **cur_name = names;
 
     // fourth way with pointers in a stupid complex way
-    for(cur_name = names, cur_age = ages;
-            (cur_age - ages) < count;
-            cur_name++, cur_age++)
-    {
+    while((cur_age - ages) < count) {
         printf("%s lived %d years so far.\n",
-                *cur_name, *cur_age);
+                *cur_name++, *cur_age++);
     }
 
     printf("---\n");