Change for loop in comb_sort.c

It can be compiled and passed in C89.

sorting/comb_sort.c

@@ -24,7 +24,8 @@ void sort (int *numbers, int size)
 
 void display(int *array, int n)
 {
-    for (int i = 0; i < n; ++i)
+    int i;
+    for (i = 0; i < n; ++i)
         printf("%d ", array[i]);
     printf("\n");
 }
@@ -34,7 +35,8 @@ int main()
 	int size = 6;
 	int *numbers = malloc(size*sizeof(int));
 	printf("Insert %d unsorted numbers: \n", size);
-	for (int i = 0; i < size; ++i)
+	int i;
+	for (i = 0; i < size; ++i)
 		scanf("%d", &numbers[i]);
 	printf("Initial array: ");
     display(numbers, size);