In this program, we will be calculating and print the sum of the Fibonacci series less than 100. The Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones, starting with 0 and 1. For example, the first 10 numbers in the Fibonacci series are 0, 1, 1, 2, 3, 5, 8, 13, 21, and 34. Using a `while`

loop, we will iterate through the series, adding up the numbers that are less than 100 and printing the final sum to the console. Let’s get started!

**Here is a JavaScript program that will calculate and print the sum of the Fibonacci series less than 100:**

```
function sumFibonacci() {
let sum = 0;
let current = 1;
let previous = 0;
while (current < 100) {
sum += current;
let temp = current;
current += previous;
previous = temp;
}
console.log(sum);
}
sumFibonacci();
```

**Now let’s understand How the program works**

This function first declares and initializes three variables: `sum`

, `current`

, and `previous`

. `sum`

will be used to store the sum of the Fibonacci numbers less than 100, `current`

will keep track of the current Fibonacci number, and `previous`

will keep track of the previous Fibonacci number.

The function then enters a `while`

loop that continues until `current`

is greater than or equal to 100. On each iteration of the loop, it adds the value of `current`

to `sum`

and updates the values of `current`

and `previous`

to be the sum of the two previous numbers.

After the `while`

loop completes, the function prints the value of `sum`

to the console.

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