Square root calculation

Question

want to calculate square root of given input so i used this code

var no1:Number = 2;
var no2:Number; //input for calculation
var total:Number;
total=Math.pow(no2,(1/no1));

its working , but i faced problem such as:- if i give

no2 = 25;

then it shows

total=4.9999999

to overcome this problem i used below code

total=Math.ceil(Math.pow(no2,(1/no1)));

but its okey for 25 .

total = 5

problem was if i give 21,22,23,24

for all this input it shows 5

so is there any other solutions ???

Answer 1

If you want to take the nth root. You can feed the output of your function into arbitrary rounding function like this:

/**
 * Rounds input number to specified number of decimal places. For example
 * round(4.568, 2) will return 4.57, and round(4.99, 2) will return 5.
 */
function round(num:Number, toDecimalPlaces:uint) {
   var factor:uint = Math.pow(10, toDecimalPlaces);
   return Math.round(num * factor) / factor;
}

/**
 * Returns nth root to two decimal places.
 */
function nthRoot(n:uint, num:Number) {
   return round(Math.pow(num, (1 / n)), 2);
}

Answer 2

There's a function for that.

var total:Number = Math.sqrt(no2);

Answer 3

my actual code was like this

var str:String=view.numDisplay.text;//input string
var power:Number = Number(inString.charAt(inString.indexOf('√') - 1));//to get the value before √ i.e no1
var no1:Number;
var no2:Number;
var total:Number;
if(power)
   no1=v;
else
   no1=2;
no2=getSubTerm();//method to find no2 it returns the number for calculation
total=Math.ceil(Math.pow(no2,(1/no1)));