Usage of math.round function

The Math.round function is a function used to round a number to the nearest integer. It is widely used in scenarios where floating point numbers are processed, such as in calculating amounts, statistics, etc.

The Math.round() function is a built-in function in JavaScript that rounds a number to the nearest integer.

The syntax of this function is as follows:

Math.round(x)

Where, x is the number to be rounded.

The Math.round() function works as follows:

If x is a positive number and the decimal part is greater than or equal to 0.5, return the smallest integer greater than x.

If x is a positive number and the decimal part is less than 0.5, return the largest integer less than x.

If x is a negative number and the decimal part is greater than or equal to -0.5, return the largest integer less than x.

If x is a negative number and the decimal part is less than -0.5, return the smallest integer greater than x.

If x is an integer, return x directly.

The following are some examples to illustrate the use of Math.round() function:

Example 1:

Math.round(3.14) // 返回 3
Math.round(9.99) // 返回 10
Math.round(-5.6) // 返回 -6

Example 2:

Math.round(2.5) // 返回 3
Math.round(2.4) // 返回 2
Math.round(-2.5) // 返回 -2
Math.round(-2.4) // 返回 -2

Things to note Yes, the Math.round() function returns an integer, not a floating point number. Therefore, regardless of whether the input is an integer or a floating point number, the return value is an integer.

In addition, it is worth mentioning that the Math.round() function does not change the original number, but returns a new rounded integer. If you need to change the value of the original number, you can assign the return value to a variable.

In summary, the Math.round() function is a function used to round a number to the nearest integer. It is widely used in scenarios where floating point numbers are processed, such as in calculating amounts, statistical data, etc.

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