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### 12.2 Recalling Variables

The most straightforward way to extract the stored value from a variable is to use the `s r` (`calc-recall`) command. This command prompts for a variable name (similarly to `calc-store`), looks up the value of the specified variable, and pushes that value onto the stack. It is an error to try to recall a void variable.

It is also possible to recall the value from a variable by evaluating a formula containing that variable. For example, `' a RET =` is the same as `s r a RET` except that if the variable is void, the former will simply leave the formula ‘`a`’ on the stack whereas the latter will produce an error message.

The `r` prefix may be followed by a digit, so that `r 9` is equivalent to `s r 9`.