If

 

If>expression[,true_label_name[,false_label_name]]

 statements  

[ [Else

 else statements]

Endif ]

 

Evaluates expression.  If the expression is true the first statements are executed.  If the expression is false the statements after Else are executed.  Else is optional.  IF blocks can be nested.  When label names are provided execution of the script jumps to the specified labels or subroutine names.  If label names are specified Else and Endif are ignored and are unnecessary.

 

The expression can be simple (legacy), or complex.

 

Complex Expressions

 

The expression must be contained within curly braces "{" and "}".  String literals must be delimited with double quotes ("), e.g.:

"string".  Variables must be delimited with % symbols, e.g.: %VarA%.

 

Several types of operators and functions can be used with complex expressions.  For more details see Complex Expressions.

 

Simple Expressions

 

Simple expressions can contain only two parts separated by one of the following operators:

 

=                Equals

>                Greater than

<                Less than

<>                Not Equal

 

Values in the expression can be numeric or string values, or variables containing such values.  Spaces must not be used as simple expressions do not require string delimiters.

 

See also: SkipLabel | Assigned | EndWhile | END | Exit | Goto | Gosub | IfNot | Include | IncludeFromVar | Label | Let | Macro | OnEvent | Remark | Repeat | SRT | Until | Wait | WaitReady | While 

 

Example

 

Let>a=5

//simple expression only

IF>a=5

    //do something

ELSE

    //do something else

ENDIF

 

//complex expression:

IF>{(%a% = 5) AND (%VarA% = "allen")}

   //do something

ELSE

   //do something else

ENDIF

 

//using labels

Label>Start

..

..

..

If>a<b,Start