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My BASIC Notes

ABS
Abbreviation: A <SHIFT+B>

TYPE: Function-Numeric
FORMAT: ABS(<expression>)

Action: Returns the absolute value of the number, which is its value without any signs. The absolute value of a negative number is that number multiplied by -1.

EXAMPLES of ABS Function:

10 X = ABS (Y)
10 PRINT ABS (X*J)
10 IF X = ABS (X) THEN PRINT"POSITIVE"