To round any number to its nearest
whole number, use the overloaded static `Math.Round`

method, which takes only a single arguments:

int x = (int)Math.Round(2.5555); // x == 3

If you need to round a floating-point value to a specific number of
decimal places, use the overloaded static
`Math.Round`

method, which takes two arguments:

decimal x = Math.Round(2.5555, 2); // x == 2.56

The `Round`

method is easy to use; however, you need
to be aware of how the rounding operation works. The
`Round`

method follows the IEEE Standard 754,
section 4 standard. This means that if the number being rounded is
halfway between two numbers, the `Round`

operation
will always round to the even number. An example will show what this
means to you:

decimal x = Math.Round(1.5); // x == 2 decimal y = Math.Round(2.5); // y == 2

Notice that `1.5`

is rounded up to the nearest even
whole number and `2.5`

is rounded down to the
nearest even whole number. Keep this in mind when using the
`Round`

method.

See Recipe 1.1; see the “Math Class” topic in the MSDN documentation.

Start Free Trial

No credit card required