I know many other languages use the eval() function to take a string argument and evaluate it as part of the source code (so you can run a function or assign a variable etc). I've seen it in PHP, ...

In general, a macro language function processes one or more arguments and produces a result. You can use all macro functions in both macro definitions and open code. Macro functions include character ...

The macro facility is a string handling facility. However, in specific situations, the macro processor can evaluate operands that represent numbers as numeric values. When the macro processor ...