Flipping Bits

This problem asks the solver to print the flipped bits of 32bit unsigned integer.
In detail, you would be provided an integer -

9 (base 10)

You have to write a function such that it returns the 32 bit unsigned decimal integer result -

4294967286 (base 10)

All code would be in Javascript but you can use any language to solve this problem.

How one goes from 9 to 4294967286?

first take the input and convert it a string using toString() function
```
let s=n.toString(2);
```
initialize a new variable and assign it to 32-(length of string)
```
let temp=32-s.length;
```
Why temp is equal to 32-s.length - variable s stores the number in binary format i.e. n=9 in decimal and s would store "1001" in binary {datatype of s is string here}, you are asked in this case to generate a 32 bit integer so to add the remaining bits in s, we assign temp to the given formula.
initialize a new variable and assign it to an empty string
```
let temp_s="";
for(let i=0;i<temp;i++)
  temp_s+="0";
```
temp_s appends 0 to an empty string of length temp.
res_s would hold the string full of 0 and the converted string of the number in binary format
```
let res_s=temp_s+s;
```
res_s=00000000000000000000000000001001
flip_s would store the flipped string as 1 would convert to 0 and 0 to 1
```
let flip_s="";
```
we use for of loop to traverse through string res_s
```
for(let i of res_s) {
      if(i==="0")
          flip_s+="1";
      else if(i==="1")
          flip_s+="0";
  }
```
Here every element in the string is checked for 0 and 1 and assigned to 1 and 0 respectively.

flip_s=11111111111111111111111111110110
print the value of given expression on console/prompt screen
```
console.log( parseInt(flip_s, 2));
```
Here, parseInt() method converts the flip_s variable to decimal form and output results in

4294967286

This problem is the part of HackerRank's 1 Month Interview Prep Kit.

Solutions