JAVASCRIPT

math round

// There are many ways of rounding...
Math.ceil(5.5) // Answer 6, rounds up.
Math.round(5.5) // Answer 6, rounds to the closest whole number.
Math.floor(5.5) // Answer 5, rounds down.

// ceil is short for ceiling(up), floor is down...

Math Round

const round = (n, d) => Number(Math.round(n + "e" + d) + "e-" + d)

round(1.005, 2) //1.01
round(1.555, 2) //1.56

math.round()

The Math.round()  function 
returns the value of a number rounded to the nearest integer.

Math.round(x)
// If x = 0.6 it gives you 1; if x = 2.5 it gives you 3; 
// if x=2.49999 it gives you 2.  

Math.round( 20.49); //  20
Math.round( 20.5 ); //  21
Math.round( 42   ); //  42
Math.round(-20.5 ); // -20
Math.round(-20.51); // -21

Math.round

console.log(Math.round(5.95)); // output: 6

console.log(Math.round(5.23)); // output: 5

console.log(Math.round(-15.5)); // output: -15

Math.round

import java.lang.*;

public class MathDemo {

   public static void main(String[] args) {
   
   //what is Math.round(3.45)

      double x = 3.45;

      System.out.println("Math.round(" + x + ")=" + Math.round(x));
   }
}

//the Output is 3