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Varkon MBS Programmers manual

# Variables and constants

## Variables

Variables (and constants) are declared after all parameters but before BEGINMODULE. A variable declaration reminds of a value_parameter_declaration without default_value or prompt_string.

      INT   i,j;    ! Two INT variables
      FLOAT size;   ! A FLOAT variable
      FILE  input_data,output_data; ! More than one variable separeted by commas

Variables may be indexed...

      INT   list(100);    ! Array of 100 integers
      FLOAT matrix(20,50) ! A 2-dimensional matrix 20 by 50
      FLOAT k(10,5,20,6)  ! A 4-dimensional matrix

and declared with upper and lower limit.

      INT    list(20:50);    ! An array of 31 integers
      FLOAT  matrix(0:3,0:3) ! A 4 by 4 matrix
      STRING names(0:9)*20;  ! An array of 10 names

If no lower limit is specified MBS uses a lower limit of 1 as default.

## Constants

A constant is like a variable but may not be indexed and may not have its value changed. Instead its value is defined once and for all in its declaration...

      CONSTANT FLOAT  max_diameter=20.0;
      CONSTANT STRING error_message="Diameter is too large !";

The FILE type may not be used as a constant.

Here is a module with some variables and constants:

      !*********************************
      !*
      MODULE init_array();
      !*
      !*********************************
      !*
      INT   i;
      FLOAT k(100);

      CONSTANT INT min=1,max=100;

      BEGINMODULE

      for i:=min to max do
        k(i):=0.0;
      endfor;

      ENDMODULE
      !*
      !*********************************

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