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IF+
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Purpose:
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To detect occurrence of event.
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Format:
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IF+ x THEN clause [ELSE clause]
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Description: x is any expression
clause is a BASIC statement or sequence of statements (separated by commas), or a line number to branch to
If x is true, and on the previous check it was false, the clause following the THEN is executed. Otherwise the clause after the ELSE is executed.
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Example:
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10
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IF+ CHILLER THEN GOSUB 40
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20
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IF+ TIME > 12:00 THEN GOSUB 60
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30 END
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40
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PRINT “THE CHILLER HAS JUST COME ON”
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50 RETURN
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60
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REM RING LUNCH BELL
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70
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START BELL
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80
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WAIT 00:00:05
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90
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STOP BELL
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100 RETURN
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IF-
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Purpose:
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To detect occurrence of event.
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Format:
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IF- x THEN clause [ELSE clause]
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Description: x is any expression
clause is a BASIC statement or sequence of statements (separated by commas), or a line number to branch to
If x is False, and on the previous check it was true the clause following the THEN is executed. Otherwise the clause after the ELSE is executed.
Example: 10 IF- CHILLER THEN GOSUB 30 20 END
30 PRINT “THE CHILLER HAS JUST GONE OFF”
40 RETURN
