Editing Dc (computer program) (section)

===Macros===
Macros are then implemented by allowing registers and stack entries to be strings as well as numbers. A string can be printed, but it can also be executed (i.e. processed as a sequence of dc commands). So for instance we can store a macro to add one and then multiply by 2 into register m:

<pre>
[1 + 2 *] sm
</pre>

and then (using the <code>x</code> command which executes the top of the stack) we can use it like this:

<pre>
3 lm x p
</pre>