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| Title | Round numbers to a given number of digits without using banker's rounding (version 2) in Visual Basic 2005 |
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| Description | This example shows how to round numbers to a given number of digits without using banker's rounding (version 2) in Visual Basic 2005. |
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| Keywords | round, banker's rounding, digits, Math.Round, VB 2005 |
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| Categories | Miscellany, Tips and Tricks |
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Normally Visual Basic uses "banker's rounding." In banker's rounding, numbers with final digit 5 are rounded to the nearest even number, not to the next larger number. The idea is that statistically half of a sample of numbers are rounded up and half are rounded down.
The following code rounds the variable num to four digits and rounds away from zero (up for positive numbers, down for negative numbers) if a number's final digit is 5.
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Math.Round(num, 4, MidpointRounding.AwayFromZero)
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When you change the number in the program's TextBox, the code displays the number rounded to 1, 2, 3, and 4 digits past the decimal point using banker's rounding and non-banker's rounding so you can see the difference.
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