To add two decimal numbers in JavaScript use the toFixed() function to convert it to a string with some decimal places shaved off, and then convert it back to a number.
Output required
0.1 + 0.5 //0.6
0.2 + 0.3 //0.5
But what actually getting
0.1 + 0.2 //0.30000000000000004
0.01 + 0.06 //0.06999999999999999
Solution 1: Use toFixed
+(0.1 + 0.2).toFixed(12) // 0.3Solution 2: Use Math.round
Math.round((0.1 + 0.2) * 1e12) / 1e12For example add two decimal numbers in JavaScript
Simple example code script that adds two numbers (decimal numbers) together.
<!doctype html>
<head>
<script>
let a = 0.1;
let b = 0.2;
let res = a + b;
console.log(res);
let out = (a + b).toFixed(2);
console.log(out);
</script>
</head>
<body>
</body>
</html>
Output:
It looks like IE’s toFixed has some weird behavior, so if you need to support IE something like this might be better:
Math.round((0.1 + 0.2) * 1e12) / 1e12Source: stackoverflow.com/
Do comment if you have any doubts or suggestions on this JS add number topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version
Also, we can delete unnecessary zeros. When we get stored parseFloat value in variable, we pass this obtained value again through parseFloat.