back to version with long main func

ex15.c

@@ -1,16 +1,5 @@
 #include <stdio.h>
 
-
-void print_names_ages(int count, char *names[], int ages[], const char *fmt)
-{
-    int i;
-    for(i = 0; i < count; i++) {
-        printf(fmt, names[i], ages[i]);
-    }
-    printf("---\n");
-}
-
-
 int main(int argc, char *argv[])
 {
     // create two arrays we care about
@@ -21,13 +10,47 @@ int main(int argc, char *argv[])
     };
     // safely get the size of ages
     int count = sizeof(ages) / sizeof(int);
+    int i = 0;
+
+    // first way using indexing
+    for(i = 0; i < count; i++) {
+        printf("%s has %d years alive.\n",
+                names[i], ages[i]);
+    }
+
+    printf("---\n");
+
+    // setup the pointers to the start of the arrays
+    int *cur_age = ages;
+    char **cur_name = names;
 
-    print_names_ages(count, names, ages, "%s has %d years alive.\n");
+    // second way using pointers
-    print_names_ages(count, names, ages, "%s is %d years old.\n");
+    for(i = 0; i < count; i++) {
-    print_names_ages(count, names, ages, "%s is %d years old again.\n");
+        printf("%s is %d years old.\n",
-    print_names_ages(count, names, ages, "%s lived %d years so far.\n");
+                *(cur_name+i), *(cur_age+i));
+    }
+
+    printf("---\n");
+
+    // third way, pointers are just arrays
+    for(i = 0; i < count; i++) {
+        printf("%s is %d years old again.\n",
+                cur_name[i], cur_age[i]);
+    }
+
+    printf("---\n");
+
+    // fourth way with pointers in a stupid complex way
+    for(cur_name = names, cur_age = ages;
+            (cur_age - ages) < count;
+            cur_name++, cur_age++)
+    {
+        printf("%s lived %d years so far.\n",
+                *cur_name, *cur_age);
+    }
+
+    printf("---\n");
 
-    int i;
     char **arg = argv;
     for(i = 0; i < argc; i++) {
         printf("argument %d is '%s' (address = %p)\n", i, *arg, arg);