| Introduction | MTB Statements | File System | Compiler | Applications | Reference Guide | Index |
| Overview | Creating MTB Source Programs | Compiling MTB Programs | Compiler Directives | Special Characters |
| Syntax: | .IFDEF symbolic-constant |
| Discussion: |
The .IFDEF statement is a compiler directive. As such, it causes an action
to occur when the program is compiled, not when the program is executed.
The .IFDEF directive can appear anywhere in an MTB source program.
As part of the conditional compilation feature of the MTB compiler, the .IFDEF directive is a variation on the .IF directive. It compiles the code segment only if the symbolic constant has been defined (via the SET directive), regardless of its value. Otherwise, the code segment is not compiled. See .IFNDEF. |