How do you round to 2 decimal places in Java?

1 Answer

  1. double roundOff = Math.round(a * 100.0) / 100.0; Output is.
  2. 123.14. Or.
  3. double roundOff = (double) Math. round(a * 100) / 100; this will do it for you as well.

How do you round a number in Java?

round() method. The Math. round() method in Java is used to round a number to its​ closest integer. This is done by adding 1 / 2 1/2 1/2 to the number, taking the floor of the result, and casting the result to an integer data type.

How do you round a number to 4 decimal places in Java?

The #. 00 is for rounding up to 2 decimal places, if you want to round up to 3 or 4 places, just use #. 000 or #. 0000 to create DecimalFormat.

What is round () in Java?

The java. lang. Math. round() is a built-in math function which returns the closest long to the argument. The result is rounded to an integer by adding 1/2, taking the floor of the result after adding 1/2, and casting the result to type long.

How do you round a decimal?

There are certain rules to follow when rounding a decimal number. Put simply, if the last digit is less than 5, round the previous digit down. However, if it’s 5 or more than you should round the previous digit up. So, if the number you are about to round is followed by 5, 6, 7, 8, 9 round the number up.

How do you round a double in Java?

Round a Double to Two Decimal Places in Java

  1. Round of a double to Two Decimal Places Using Math.round(double*100.0)/100.0.
  2. Round of a double to Two Decimal Places Using BigDecimal.
  3. Round of a double to Two Decimal Places Using DecimalFormat.
  4. Round of a double to Two Decimal Places Using Apache Common Math.

How do you round a double to 3 decimal places in Java?

“java round double to 3 decimal places” Code Answer’s

  1. class round{
  2. public static void main(String args[]){
  3. ​
  4. double a = 123.13698;
  5. double roundOff = Math. round(a*100)/100;
  6. ​
  7. System. out. println(roundOff);
  8. }

What is round () method?

round() method rounds a number to the nearest integer. Note: 2.49 will be rounded down (2), and 2.5 will be rounded up (3).

How do you round numbers?

Here’s the general rule for rounding:

  1. If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. Example: 38 rounded to the nearest ten is 40.
  2. If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down. Example: 33 rounded to the nearest ten is 30.

How do you round step by step?

Step 1: Circle the place value of the digit to be rounded. This is the rounding digit. Step 2: Look to the neighboring digit on the right. Step 3: a) If the neighboring digit is less than five (0 – 4), keep the rounding digit the same.

How do you round decimal in Java?

In Java, the fastest and most convenient way to round a decimal number is using the BigDecimal class. Let’s say, we want to round some numbers like this: 7.2314 is rounded to 7.23 (two digits after decimal point). 8.3868 is rounded to 8.4 (one digit after decimal point).

How do you round in Java?

The java.lang.Math.round() is a built-in math function which returns the closest long to the argument. The result is rounded to an integer by adding 1/2, taking the floor of the result after adding 1/2, and casting the result to type long. If the argument is NaN, the result is 0.

Does Java round up or down?

Integer division in Java does not round down as you understand it (ie. to the lower value). In Java terminology, rounding down means rounding towards zero.

How do you round in JavaScript?

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);