IF Initiate IF block

Domain: PROCEDURE

Command description

The IF command initiates an IF block, i.e. a conditional command sequence: If the condition in the IF command is met, the command sequence following the IF command is executed. Otherwise, the system searches for other ELSE-IF or ELSE commands in the current IF block. If the current IF block does not contain any ELSE-IF or ELSE commands, procedure execution resumes with the command following the appropriate END-IF (see section“Defining conditional branches”).

Format

IF

CONDITION = <text 0..1800 with-low bool-expr>

Operands

CONDITION = <text 0..1800 with-low bool-expr>
Logical expression as the condition for executing the command sequence between the IF and ELSE-IF or ELSE command (see chapter “Expressions” for information on logical expression).
If the logical expression includes a single ’=’ sign, then this must be enclosed in parentheses.

Command return codes

(SC2)	SC1	Maincode	Meaning
	0	CMD0001	No error
	1	CMD0202	Syntax error
	1	SDP0118	Command in false context
	1	SDP0223	Incorrect environment
	3	CMD2203	Incorrect syntax file
	32	CMD0221	System error (internal error)
	64	SDP0091	Semantic error
	130	SDP0099	No further address space available

Example

/A = 2
/B = 3
/IF (A = B)
/WRITE-TEXT 'A AND B ARE CORRECTLY INITIALIZED'
/ELSE-IF (A > B)
/WRITE-TEXT 'A IS TOO LARGE'
/ELSE
/WRITE-TEXT 'B IS TOO LARGE'
/END-IF
B IS TOO LARGE

Note on the parentheses in the logical expressions:

(1)	The parentheses can be omitted when the “=” sign is duplicated: /IFA==B
(2)	The parentheses can be omitted: /ELSE-IFA > B