diff --git a/18_for_loop.c b/18_for_loop.c
index 60f495f..af74a75 100644
--- a/18_for_loop.c
+++ b/18_for_loop.c
@@ -6,15 +6,15 @@ int main()
     printf("\nEnter the index value for the natural number. ");
     scanf("%d", &index_value);
     //Syntax:for (intialize; test; increment / decrement)
-    for (int i = 1; i <= index_value; i++)
+    for (int i = 0; i < index_value; i++)
     {
         printf("%d\n", i);
     }
     printf("Now printing the numbers in reverse order:\n");
-    for (int i = index_value; i > 0; i--)
+    for (int i = index_value-1; i >= 0; i--)
     {
         printf("%d\n", i);
     }
     printf("\n\n");
     return 0;
-}
\ No newline at end of file
+}