Custom fields in post later used in loop

Question

How i can add custom fields to custom post templates, and later print them in The Loop?

Better explanation: I want to have a custom field in "Add New" window, which will be added as some meta data to the post, which can be later printed in the loop of single.php.

I want to be able to decide where it will be, so it can be even under comments if i want to (i want to define it in template).

I dont want "Custom Field Template" plugin because AFAIK this cannot be used inside the loop.

Answer 1

You can call get_post_custom() in The Loop, to retrieve an array with all custom fields for a post. In order to fetch a single field, you can use get_post_meta($post_id, $key, $single) with the third argument set to TRUE.