Conditional assembly language

A conditional assembly language is that part of an assembly language used to write macros.

## Example

In the IBM conditional assembly language, the most important statements are:

* MACRO and MEND - used to start and finish a macro
* AIF, AGO, ANOP, AEND, AEXIT and MEXIT - used to control the generation of different assembly language statements, depending on the nature of the macro’s supplied arguments.
* SETx - used to manipulate variables within the macro.

### Alternative use

The conditional assembler is not restricted to generating assembler code and was used by IBM in the 1970s onwards to generate COBOL or PL/1 statements for compiling into CICS application programs.

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