User Manual

269
CATC MERLIN’S WAND 1.22 APPENDIX D
User’s Manual CATC Scripting Language
In addition to the operators, the following are keywords in CSL:
D.9 Statements
Statements are the building blocks of a program. A program is made up of
list of statements.
Seven kinds of statements are used in CSL: expression statements, if
statements, if-else statements, while statements, for statements, return
statements, and compound statements.
Expression Statements
An expression statement describes a value, variable, or function.
<expression>
Here are some examples of the different kinds of expression statements:
Value: x + 3;
Variable: x = 3;
Function: Trace ( x + 3 );
Keyword Usage
select select expression
set
define a global variable
const
define a constant
return return statement
while while statement
for for statement
if if statement
else if-else statement
default select expression
null
null value
in
input context
out
output context