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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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ABS(b1)
ABS implements the Absolute Value function: the result is to drop the negative sign (if present). This can be done for integers and floating point numbers.
This function is Excel compatible.
ABS(7) equals 7.
ABS(-3.14) equals 3.14.
CEIL, FLOOR.
