.. _define:

> &nbsp_place_holder;

>

> **_DEFINE_**

>

>> Allows a number to be associated with a character string, such that the
character string can be used in input decks in place of the&nbsp_place_holder;
number. The keyword _remove _in the third argument will remove a defined
variable from the stack of defined variables.

>

> &nbsp_place_holder;FORMAT:

>

>> `**define /** name / value_real

``**define /** name / value_integer`

`**define /** name / value_character`

`**define /** name / remove`

>

> EXAMPLE:

>

>> `**define **/ nx / 3

**define **/ ny / 4   
**define** / nz / 5   
**define **/ bottom / 0.1  
**define **/ top / 4.0   
**define** / left / 9.8   
**define** / type / reflect  
  
**surface**/s1/reflect/box/0.0,left,bottom/1.0,right,top   
**rz**/xyz/nx/nz/0.0,left,bottom/1.0,right,top/1,1,1  
  
``**define **/ top / 5.0 `

`**surface**/s1/reflect/box/0.0,left,bottom/1.0,right,top

**rz**/xyz/nx/nz/0.0,left,bottom/1.0,right,top/1,1,1`  
  
`**define** / nx / remove

**define** / ny / remove  
**define** / nz / remove`