JavaScript | Math.round( ) function

The Math.round() function in JavaScript is used to round a number to its nearest integer. If the fractional part of the number is greater than or equal to .5, the argument is rounded to the next higher integer. If the fractional part of the number is less than .5, the argument is rounded to the next lower integer.

Syntax:

Math.round(var);

Parameters: This function accepts a single parameter, var. It is the number which you want to round off.

Return Value: The Math.round() function returns the value of the given number rounded to the nearest integer.

Below are some examples to illustrate the Math.round() function:

• Example 1: To round off a number to its nearest integer, the math.round() function should be implemented in the following way:
  filter_none

  edit
  close

  play_arrow

  link
  brightness_4
  code

  <script type="text/javascript">     var round =Math.round(5.8);     document.write("Number after rounding : " + round);  </script>

  chevron_right

  filter_none

  Output:

  Number after rounding : 6

• Example 2: The Math.round() function itself rounds off a negative number when passed as parameter to it. To round off a negative number to its nearest integer, the Math.round() function should be implemented in the following way:
  filter_none

  edit
  close

  play_arrow

  link
  brightness_4
  code

  <script type="text/javascript">     var round =Math.round(-5.8);     document.write("Number after rounding : " + round);  </script>

  chevron_right

  filter_none

  Output:

  Number after rounding : -6

• Example 3: Below program shows the result of Math.round() function when the parameter has “.5” in decimal.
  filter_none

  edit
  close

  play_arrow

  link
  brightness_4
  code

  <script type="text/javascript">     var round =Math.round(-12.5);     document.write("Number after rounding : " + round +     "<br>");     var round =Math.round(12.51);     document.write("Number after rounding : " + round);  </script>

  chevron_right

  filter_none

  Output:

  Number after rounding : -12
  Number after rounding : 13

Supported Browsers: The browsers supported by JavaScript Math.round( ) function are listed below:

• Google Chrome
• Internet Explorer
• Firefox
• Opera
• Safari



My Personal Notes arrow_drop_up
Save

Recommended Posts:

• How to call a function that return another function in JavaScript ?
• JavaScript | toPrecision( ) Function
• How to override a JavaScript function ?
• JavaScript | Array every() function
• JavaScript | toFixed( ) Function
• JavaScript | Function binding
• JavaScript | toString( ) function
• JavaScript | Array.of() function
• JavaScript | String() Function
• Javascript | Number() Function
• What is the inline function in JavaScript ?
• JavaScript | Array some() function
• JavaScript | Math.abs( ) function
• JavaScript | Function Invocation
• JavaScript | toExponential() Function

---


Shubrodeep Banerjee
I am a technology enthusiast who has a keen interest in programming I am pursuing Engineering in Computer Science from GEU, Dehradun I like to unwind by watching movies and English sitcomsI have a keen interest in music

---

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.