 # JavaScript: Calculate the sum of n + n/2 + n/4 + n/8 + ....

## JavaScript Basic: Exercise-113 with Solution

Write a JavaScript program to calculate the sum of n + n/2 + n/4 + n/8 + .... where n is a positive integer and all divisions are integer.

Pictorial Presentation: Sample Solution:

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title> Calculate the sum of n + n/2 + n/4 + n/8 + ....</title>
<body>

</body>
</html>
```
```

JavaScript Code:

``````function int_sum(num) {
var s_sum = 0;
while (num > 0) {
s_sum += num;
num = Math.floor(num / 2);
}
return s_sum;
}
console.log(int_sum(8))
console.log(int_sum(9))
console.log(int_sum(26))
``````

Sample Output:

```15
16
49
```

Flowchart: ES6 Version:

``````function int_sum(num) {
let s_sum = 0;
while (num > 0) {
s_sum += num;
num = Math.floor(num / 2);
}
return s_sum;
}
console.log(int_sum(8))
console.log(int_sum(9))
console.log(int_sum(26))
``````

Live Demo:

See the Pen javascript-basic-exercise-113 by w3resource (@w3resource) on CodePen.

What is the difficulty level of this exercise?

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## JavaScript: Tips of the Day

Classes/function constructors

```class Person {
constructor() {
this.name = 'Owen';
}
}

Person = class AnotherPerson {
constructor() {
this.name = 'Eddie';
}
};

const member = new Person();
console.log(member.name);
```

We can set classes equal to other classes/function constructors. In this case, we set Person equal to AnotherPerson. The name on this constructor is Eddie, so the name property on the new Person instance member is "Eddie".

Ref: https://bit.ly/3jFRBje