- Trending Categories
- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP

- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who

# Number of integers with odd number of set bits in C++

Given a number n, we have to find the number of integers with an odd number of set bits in their binary form. Let's see an example.

**Input**

n = 10

**Output**

5

There are 5 integers from 1 to 10 with odd number of set bits in their binary form.

## Algorithm

Initialise the number N.

- Write a function to count the number of set bits in binary form.
Initialise the count to

**0.**Write a loop that iterates from

**1**to**N.**Count the set bits of each integer.

Increment the count if the set bits count is odd.

Return the count.

## Implementation

Following is the implementation of the above algorithm in C++

#include <bits/stdc++.h> using namespace std; int getSetBitsCount(int n) { int count = 0; while (n) { if (n % 2 == 1) { count += 1; } n /= 2; } return count; } int getOddSetBitsIntegerCount(int n) { int count = 0; for (int i = 1; i <= n; i++) { if (getSetBitsCount(i) % 2 == 1) { count += 1; } } return count; } int main() { int n = 10; cout << getOddSetBitsIntegerCount(n) << endl; return 0; }

## Output

If you run the above code, then you will get the following result.

5

- Related Questions & Answers
- Next higher number with same number of set bits in C++
- Maximum number of contiguous array elements with same number of set bits in C++
- Minimum number using set bits of a given number in C++
- Sorting Integers by The Number of 1 Bits in Binary in JavaScript
- Program to find higher number with same number of set bits as n in Python?
- Prime Number of Set Bits in Binary Representation in C++
- Prime Number of Set Bits in Binary Representation in Python
- Maximum sum by adding numbers with same number of set bits in C++
- Number of pairs with Bitwise OR as Odd number in C++
- Number of 1 Bits in Python
- Check if a number has same number of set and unset bits in C++
- Check if bits of a number has count of consecutive set bits in increasing order in Python
- Check if all bits of a number are set in Python
- For every set bit of a number toggle bits of other in C++
- Previous smaller integer having one less number of set bits in C++

Advertisements