# JavaScript: Convert a float-point arithmetic to the Decimal mark form and It will make a comma separated string from a number

## JavaScript: Exercise-125 with Solution

Write a JavaScript program that converts float-point arithmetic to decimal form, and creates a comma separated string from a number.

• Use Number.prototype.toLocaleString() to convert the number to decimal mark format.

Sample Solution:

JavaScript Code:

``````//#Source https://bit.ly/2neWfJ2

// Define the 'toDecimalMark' function.
const toDecimalMark = num => num.toLocaleString('en-US');

// Test the 'toDecimalMark' function with sample inputs.
console.log(toDecimalMark(12305030388.9087)); // Output: "12,305,030,388.909"
console.log(toDecimalMark(123.2264)); // Output: "123.226"
console.log(toDecimalMark(-100.10)); // Output: "-100.1"
```
```

Output:

```12,305,030,388.909
123.226
-100.1
```

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-125-1 by w3resource (@w3resource) on CodePen.

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