Round decimals JavaScript [duplicate] - javascript

This question already has answers here:
Is floating point math broken?
(31 answers)
Closed 3 years ago.
I try to get the difference between two decimals but i need a short number. Example:
var number1 = 1.1500
var number2 = 1.1550
var result = parseFloat(number2) - parseFloat(number1);
This way, i get "0.0050000000000001155" but i just need "0.0050".
Thanks :)


you can use toFixed(). And you don't need to call parseFloat the numbers are already float
var number1 = 1.1500
var number2 = 1.1550
var result = +(number2 - number1).toFixed(5);
console.log(result)

Related

JavaScript do wrong multiplication when the numbers are too larger || return round off of multiplication result [duplicate]

This question already has answers here:
Extremely large numbers in javascript
(5 answers)
What is the standard solution in JavaScript for handling big numbers (BigNum)?
(1 answer)
Closed 3 months ago.
I am try to solve a problem of LEETCODE using JavaScript, the problem is Multiply Strings and the solution is:
const string = (num) => {
return '' + num
}
var multiply = function(num1, num2) {
let result = string(num1*num2)
return result
};
console.log(multiply("123456789",
"987654321"))
it should return "121932631112635269"
but it returns 121932631112635260
Any Solution?
"123456789" * "987654321" should return "121932631112635269"
but it returns 121932631112635260

how to convert string to number has 19 digit without auto rounded in javaScript? [duplicate]

This question already has answers here:
Extremely large numbers in javascript
(5 answers)
Is floating point math broken?
(31 answers)
Closed 4 months ago.
we have string input number
input="6145390195186705543"
if we want to convert to number ;java Script auto rounded this input;
(6145390195186705543)
(6145390195186705000)

This should work for what you are trying to achieve
const myFunction = (num) => {
const length = num.length;
const result = `(${num.slice(0,16).padEnd(length, "0")})`;
return result;
};
const input="6145390195186705543";
const output = myFunction(input);
console.log(output)

JavaScript arithmetic subtraction giving extra unwanted decimal digits [duplicate]

This question already has answers here:
Is floating point math broken?
(31 answers)
Closed 2 years ago.
var a = 8.4286;
var b = 2;
console.log(a-b)
Actual Output: 6.428599999999999
Expected Output: 6.4286
What is the reason behind this and how to get around it?

You can use .toFixed:
var a = 8.4286;
var b = 2;
let sub = a-b;
sub = sub.toFixed(4);
console.log(sub);

How would I get this function to only return three numbers? [duplicate]

This question already has answers here:
How do you round to 1 decimal place in Javascript?
(24 answers)
Rounding a number to one decimal in javascript [duplicate]
(4 answers)
Round values to one decimal place in javascript [duplicate]
(2 answers)
How to show one decimal place (Without rounding) and show .0 for whole numbers?
(4 answers)
Closed 3 years ago.
**<script>
function roundNum() {
var f = document.getElementById("f").value;
var g = document.getElementById("g").value
var g = g-u
document.getElementById("ng").innerHTML = g
</script>**
I am trying to receive a three-digit answer (example: 95.7, instead of 95.6923531)

You can use the javascript toFixed() method.
Example:
var x = 9.656;
x.toFixed(1); // returns 9.7
x.toFixed(2); // returns 9.66
x.toFixed(4); // returns 9.6560
x.toFixed(6); // returns 9.656000

Try this..
Syntax:
number.toFixed(x)
var num = 95.6923531;
console.log(num.toFixed(1));
console.log(num.toFixed(2));
console.log(num.toFixed(3));

Multiply numbers with more than 4 decimal points [duplicate]

This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
round number in JavaScript to N decimal places
This may be easy for you guys,
My question is:
How can I control a decimal places in a floating point value.
Ex.: My result is returning 0.365999999999999; but I need to show just 4 decimal numbers.
Check the demo: Demo (I accept any others ways to calculate that)
Thanks!

You can use .toFixed
var number = 0.365999999999999;
var rounded = number.toFixed(4); // 0.3660

try this:
$("#test").keyup(function(){
var number = parseFloat($("#number").text());
var current = parseFloat($(this).val());
var total = number*current;
$("#result").val(total.toFixed(4));
});

$("#result").val(total.toFixed(4));

Javascript has a nice round function, but it only does integers so you have to multiply it by 10000 then divide the rounded result by 10000
http://www.javascriptkit.com/javatutors/round.shtml
The toFixed function always rounds up, but round will probably do what you want.

For proper rounding:
function roundNumber(number, digits) {
var multiple = Math.pow(10, digits);
var rndedNum = Math.round(number * multiple) / multiple;
return rndedNum;
}
For rounding up:
number.toFixed(4);

$("#test").keyup(function(){
var number = $("#number").text();
var current = $(this).val();
var total = parseFloat(number*current).toFixed(2);
$("#result").val(total);
});
Cast the variable to a float and then use the toFixed() method

If you follow the link below you can import the number_format php function to javascript. The function has been helping me for years now.
Here is the function signature :
function number_format (number, decimals, dec_point, thousands_sep)
http://phpjs.org/functions/number_format:481

Categories