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Commands - 57

IF / THEN / ELSE

Statement

SYNTAX: IF m THEN statement(s) [ELSE statement(s)]

IF m GOTO line/label

IF m THEN line/label

PURPOSE: To make decisions regarding progr am flow based on the results returned by an expression.

REMARK S: If the expression m is true (not zero), the TH EN clause is executed. THEN may be followed by

either a line number for branching or one or more statements to be executed.

If the result of m is false (zero), the THE N line is ignored and the ELSE line, if present, is executed.

Otherwise execution continues w ith the next exec utable statem ent.

THE N or ELSE may be followed by e ither a line number for branching, or one or more statements

to be executed. IF/THEN/E LSE statements may be nested.

10 IF A=B THEN C=2 ELSE IF A=J THEN PRINT J

If an IF. . THEN statement is followed by a line number in the Immediate Mode, a < Line not

found> error results, unless a statement with the specified line number had been previously entered

in the Program Mode.

NOTE: If a label is used, it must be the last statement on the line. If a label follows GOTO or

THEN, there cannot be an ELSE.

EXAMPLE: 10 IF PEEK(5000)=27 THEN B=34 ELSE B=12

ERROR: < Expected THE N> – if THEN missing

< Can’t compile> – if line/label does not exist

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Remote-processing CAMBASIC Manuale Utente Pagina 90