To eliminate rightmost digits in a number when absolute precision is not required or used. One of the most common uses of rounding is with dollar amounts, which can result in more than two decimal places after a division. Following are four of many rounding methods:
Rounding and a Lot More
For more ways to round numbers than you can imagine, as well as to learn how computers perform mathematical functions at the circuit level, read the entertaining and informative book, "How Computers Do Math" by Clive "Max" Maxfield and Alvin Brown. (John Wiley & Sons, Inc. 2005, ISBN 0-471-73278-8).
Round Half Up 3.455 -> 3.46
3.454 -> 3.45
Round Half Down 3.455 -> 3.45
3.456 -> 3.46
Round Up 3.456 -> 3.46
3.453 -> 3.46
Round Down 3.458 -> 3.45
3.453 -> 3.45
Rounding and a Lot More
For more ways to round numbers than you can imagine, as well as to learn how computers perform mathematical functions at the circuit level, read the entertaining and informative book, "How Computers Do Math" by Clive "Max" Maxfield and Alvin Brown. (John Wiley & Sons, Inc. 2005, ISBN 0-471-73278-8).
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
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