Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
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
Count Unset Bits of a Number in C++
We are given an integer number let’s say, num and the task is to firstly calculate the binary digit of a number and then calculate the total unset bits of a number.
Unset bits in a binary number is represented by 0. Whenever we calculate the binary number of an integer value then it is formed as the combination of 0’s and 1’s. So, the digit 0 is known as unset bit in the terms of the computer.
Input − int number = 50
Output − Count of total unset bits in a number are − 3
Explanation − Binary representation of a number 50 is 110010 and if we calculate it in 8-digit number then two 0’s will be appended in the beginning. So, the total unset bits in a number are 3.
Input − int number = 10
Output − Count of total unset bits in a number are: 6
Explanation − Binary representation of a number 10 is 00001010 and if we calculate it in 8-digit number then four 0’s will be appended in the beginning. So, the total unset bits in a number are 6.
Approach used in the below program is as follows
Input the number in a variable of integer type
Declare a variable count to store the total count of set bits of type unsigned int
Start loop FOR from i to 1<<7 and i > 0 and i to i / 2
Inside the loop, check num & 1 == TRUE then print 1 else print 0
Inside the loop, increment the value of total digits in a number.
Start loop while to calculate the total count of bits till number isn’t 0
Inside the loop, set count = count + number & 1 and also set number >>=1
Set count as total digits in a number - total set bits in a number.
Print the count
Example
#include<iostream>
using namespace std;
//Count total unset bits in a number
unsigned int unset_bits(unsigned int number){
unsigned int total_digits = 0;
unsigned int count = 0;
unsigned i;
//display the total 8-bit number
cout<<"8-bit digits of "<<number<<" is: ";
for (i = 1 << 7; i > 0; i = i / 2){
(number & i)? cout<<"1": cout<<"0";
total_digits++;
}
//calculate the total unset bits in a number
while (number){
count += number & 1;
number >>= 1;
}
count = total_digits - count;
cout<<"\nCount of total unset bits in a number are: "<<count;
}
int main(){
int number = 50;
unset_bits(number);
return 0;
}
Output
If we run the above code it will generate the following output −
8-bit digits of 50 is: 00110010 Count of total set bits in a number are: 5
735 Views
