Question

How to count the total bits of a number that equal to one (1) in Java

Answer 1

import java.io.*;  

public class MyClass {
    static int count_bits(int n) { 
        int count = 0; 
        while (n > 0) { 
            count += n & 1; 
            n >>= 1; 
        } 
        return count; 
    } 
    public static void main(String args[]) {
        int n = 1358;
        
        System.out.println(Integer.toBinaryString(n));
        
        System.out.println(count_bits(n)); 
    }
}


/*
run:

10101001110
6

*/

 

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