Like other mathematical functions they are (logically) part of the class

*Math*.

For "standard" rounding there is the function

*Round()*. This expects as the first parameter the number which is to be rounded and as a second optional one the number of decimal places after rounding. If this parameter is not used, 0 is assumed, meaning the number is rounded to the closest integer.

But there are 2 more interesting functions:

*Ceiling()*and

*Floor()*.

Both functions round to integers, the first one to the next highest integer and the second on to the next lowest one.

The following example should make this clear:

decimal d = (decimal)1.5642; // here "1.5642" has to be converted manually with (decimal) to a decimal value, since C# interprets floating numbers as double by standard

decimal RoundedIntegerNumber = Math.Round(d); // round to integer = 2

decimal RoundedDecimalNumber = Math.Round(d, 2); // round with 2 decimal places = 1.56

decimal NextHigherNumber = Math.Ceiling(d); // round to next highest integer = 2

decimal NextLowerNumber = Math.Floor(d); // round to next lowest integer = 1

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