# 1.Reverse Bits

```
Example 1:
Input: 00000010100101000001111010011100
Output: 00111001011110000010100101000000
Explanation: The input binary string 00000010100101000001111010011100 represents the unsigned integer 43261596, so return 964176192 which its binary representation is 00111001011110000010100101000000
```

```cpp
class Solution
{
public:
    uint32_t reverseBits(uint32_t n)
    {

        bitset<32> b(n);

        int start = 0;
        int end = 31;
        while (start <= end)
        {
            if (b[end] == 1 && b[start] == 0)
            {
                b.set(start, 1);
                b.set(end, 0);
            }
            else if (b[end] == 0 && b[start] == 1)
            {
                b.set(start, 0);
                b.set(end, 1);
            }

            start++;
            end--;
        }

        return b.to_ulong();
    }
};
```

**Time Complexity: O(n )**

## Reverse Bits when an integer is given and return an integer

```cpp
unsigned int revBits(unsigned int n)
{

    int rev = 0;
    while (n > 0)
    {
        // bitwise left shift
        // 'rev' by 1
        rev <<= 1;

        // if current bit is '1'
        if (n & 1 == 1)
        {
            rev = rev ^ 1;
        }

        // bitwise right shift
        // 'n' by 1
        n >>= 1;
    }
    return rev;
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://soumyajit4419.gitbook.io/ds-algo/bits-manipulation-and-mathematics/reverse-bits.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.