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Print bitwise AND set of a number N in C++
In this problem, we have to print all the numbers from 0 to n which are Bitwise AND of a binary of n.
Let’s take an example to understand the concept better.
Input : N = 4. Output : 0 4 Explanation : 0 & 4 = 0 1 & 4 = 0 2 & 4 = 0 3 & 4 = 0 4 & 4 = 4. Input : N = 6 Output : 0, 2, 4, 6
To solve this problem, we need to use bitwise operators. Using these we will find the required subsets. We will iterate backward from n to 1 using a different update function that will use only those values that return are outputs of and operation of some AND with n. The operation would be i = (i-1) & N.
Based on this idea lets create an algorithm −
Algorithm
Step 1 : Loop from n to 1 using decrement operator i = (i-1) & n Step 2 : PRINT i. Step 3 : EXIT.
Example
Program implementation of the above algorithm −
#include <iostream>
using namespace std;
int main() {
int n = 11;
for (int i = n; i > 0; i = (i - 1) & n)
cout << i << " ";
cout << 0;
return 0;
}Output
11 10 9 8 3 2 1 0
Updated on: 03-Jan-2020
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