In this program, You will learn how to find the sum of digits of a number in JavaScript.

```
while (Condition) {
Statement
Increment/Decrement
}
```

## Example: How to find the sum of digits of a number in JavaScript

```
let num = parseInt(prompt("Enter a number:"));
let sum = 0
while (num > 0) {
r = num % 10;
sum = sum + r;
num = parseInt(num / 10);
}
console.log("Sum of digits of a number:" + sum);
```

#### Output:

```
Enter a number:> 3452
Sum of digits of a number:14
```