# JavaScript - Turn on the k^{th} bit of a given number

## JavaScript Bit Manipulation: Exercise-10 with Solution

Write a JavaScript program to turn on the k^{th} bit of a given number. Return the updated number.

**Test Data:**

(33, 3)-> 37

Explanation:

Binary format of 33 is -> 100001

Fortmat of the said number after on the 3rd bit -> 100101

After converting 100101 to decimal : 100101 -> 37

(101, 5) -> 117

Explanation:

Binary format of 100 is -> 1100101

Fortmat of the said number after on the 5th bit -> 1110101

After converting 1110101 to decimal : 1110101 -> 117

**Sample Solution: **

**JavaScript Code:**

```
// Define a function to turn on the kth bit of a number
const turn_On_Kth_Bit = (n, k) => {
// Check if the input is not a number
if (typeof n != "number") {
return 'It must be number!'; // Return an error message
}
// Return the result of performing a bitwise OR operation with the kth bit
return n | (1 << (k - 1));
}
// Initialize variables n and k with values
let n = 33;
let k = 3;
// Display the binary representation of n
console.log(n + " in binary is " + n.toString(2));
console.log("Turning k'th bit on," + " k = " + k);
// Call the turn_On_Kth_Bit function and display the result
let result_n = turn_On_Kth_Bit(n, k);
console.log(result_n + " in binary is " + result_n.toString(2));
// Update variables n and k with new values
n = 101;
k = 5;
// Display the binary representation of n
console.log(n + " in binary is " + n.toString(2));
console.log("Turning k'th bit on," + " k = " + k);
// Call the turn_On_Kth_Bit function and display the result
result_n = turn_On_Kth_Bit(n, k);
console.log(result_n + " in binary is " + result_n.toString(2));
```

Output:

33 in binary is 100001 Turning k'th bit on, k = 3 37 in binary is 100101 101 in binary is 1100101 Turning k'th bit on, k = 5 117 in binary is 1110101

**Flowchart: **

**Live Demo: **

See the Pen javascript-bit-manipulation-exercise-10 by w3resource (@w3resource) on CodePen.

* To run the code mouse over on Result panel and click on 'RERUN' button.*

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