Math.Round Function Explained: Rounding Numbers

The Math.Round function is a commonly used mathematical function that rounds a number to the nearest integer. Its syntax is as follows:

Round the number to the nearest whole number.

Here, num is the number that needs to be rounded.

The Math.Round function returns the nearest integer after rounding. If the number is less than 0.5, the return value is the largest integer less than the number; if the number is greater than or equal to 0.5, the return value is the smallest integer greater than or equal to the number.

Here are some examples:

Math.Round(3.2) // returns 3
Math.Round(3.7) // returns 4
Math.Round(-3.2) // returns -3
Math.Round(-3.7) // returns -4

It is important to note that the Math.Round function by default uses a rounding algorithm. If the decimal part of num is exactly 0.5, the return value will be the closest even number. For example:

Math.Round(2.5) // returns 2
Math.Round(3.5) // returns 4

If you need to change the rounding algorithm, you can use the overloaded method of the Math.Round function as follows:

Round the number “num” to the specified number of “digits” decimal places.

The variable “digits” specifies the number of decimal places to be retained. For example:

Math.Round(3.14159, 2) // Returns 3.14
Math.Round(3.14159, 3) // Returns 3.142

This allows you to keep a specified number of decimal places after rounding. If digits is a negative number, the result will be an integer.

In short, the Math.Round function is a very common mathematical function that can round a number to the nearest whole number or specified decimal place. It is frequently used in daily programming.